7784-23-8

Usage

Uses

Used in Organic Synthesis:
Aluminum Iodide is used as a catalyst in organic synthesis for breaking certain kinds of C-O and N-O bonds. It is particularly effective in cleaving aryl ethers and deoxygenating epoxides, making it a valuable tool in the synthesis of various organic compounds.
Used in Iodinated Organic Compounds Production:
Aluminum Iodide is employed in the manufacture of iodinated organic compounds, which have a wide range of applications in the pharmaceutical, agrochemical, and chemical industries.
Used in Energy Storage:
ALUMINUM IODIDE may be used as an additive for electrolytes in lithium-ion batteries, contributing to improved energy storage and performance of these batteries.
Chemical Properties:
Aluminum Iodide is a powdery substance with unique chemical properties, including its ability to act as a catalyst and its reactivity with various organic compounds. Its dark purple or black crystalline form at room temperature adds to its distinctive characteristics.

Hazard

Reacts violently with water.

InChI:InChI=1/Al.3HI/h;3*1H/q+3;;;/p-3

Synthetic route

iodine (7553-56-2) + aluminium (7429-90-5) → aluminium(III) iodide (7784-23-8)

Conditions	Yield
In hexane thin foil of Al was suspended in degassed n-hexane under argon, 1.5 equiv. I2 was added, mixt. was boiled under reflux for 1-3 h; filtered into a heated receiver; elem. anal.;	96%
In further solvent(s) sheet aluminium in I2/ethyl iodide soln.;; impurities of I2;;
In neat (no solvent) addn. of Al to molten I2, ignition and melting of the metal;;

iodine (7553-56-2) + glycerol (56-81-5) + aluminium (7429-90-5) → hydrogen (1333-74-0) + aluminium(III) iodide (7784-23-8)

Conditions	Yield
In water in glycerine-soln. on heating;;

aluminium (7429-90-5) + ferrous iodide → aluminium(III) iodide (7784-23-8) + iron (7439-89-6)

Conditions	Yield
In water byproducts: H2, Al(OH)3;

hydrogen iodide (10034-85-2) + aluminium (7429-90-5) → aluminium(III) iodide (7784-23-8)

Conditions	Yield
In neat (no solvent) byproducts: H2;
In neat (no solvent) byproducts: H2;

aluminium (7429-90-5) + silver(I) iodide → aluminium(III) iodide (7784-23-8)

Conditions	Yield
heating till AgI softens, part of AlI3 is sublimated;
heating till AgI softens, part of AlI3 is sublimated;

zinc(II) selenide + AlSeI → Zn2AlSe3I + aluminium(III) iodide (7784-23-8)

Conditions	Yield
In neat (no solvent) mixt. of the starting materials heated in evacuated sealed quartz tubes to 500-900°C; decompn. of educts ocurrs, AlI3 sublimates off;	A 0% B n/a

zinc telluride + AlTeI → Zn2AlTe3I + aluminium(III) iodide (7784-23-8)

Conditions	Yield
In neat (no solvent) mixt. of the starting materials heated in evacuated sealed quartz tubes to 500-900°C; decompn. of educts ocurrs, AlI3 sublimates off;	A 0% B n/a

tin(IV) iodide + aluminium (7429-90-5) → aluminium(III) iodide (7784-23-8)

Conditions	Yield
In neat (no solvent) formation at reaction of metallic Al with molten SnI4;;

aluminum triiodide dimer → aluminium(III) iodide (7784-23-8)

Conditions	Yield
In neat (no solvent) at 381°C;;

tantalum pentaiodide (14693-81-3) → tantalum tetraiodide (14693-80-2) + aluminium(III) iodide (7784-23-8)

Conditions	Yield
With aluminium in stoichiometric ratio of educts, 325°C in closed evacuated tube; removal of AlI3 by sublimation at 250 °C;
With Al in stoichiometric ratio of educts, 325°C in closed evacuated tube; removal of AlI3 by sublimation at 250 °C;

AlTeI → Al2Te3, cubic, metastable + aluminium(III) iodide (7784-23-8)

Conditions	Yield
In neat (no solvent, solid phase) thermal decompn. by heating at 385°C for 48 h in an evacuated sealed glass ampoule; AlI3 sublimates to the cold end of the ampoule;

[Mg7(μ3-OCH2CH2OMe)6(μ-OCH2CH2OMe)6][tetra(n-butyl)aluminate]2 + iodine (7553-56-2) → aluminium(III) iodide (7784-23-8)

Conditions	Yield
In tetrahydrofuran byproducts: C4H9I; iodide-ion was also formed;

bismuth(III) sulfide + aluminium(III) iodide (7784-23-8) → bismuth(III) iodide (7787-64-6)

Conditions	Yield
In neat (no solvent) byproducts: Al2S3; heating a mixture of molten AlI3 and Bi2S3 in an evacuated tube at 230°C for 48 hours;; sublimation in vacuum at 400°C;;	100%
In neat (no solvent) byproducts: Al2S3; heating a mixture of molten AlI3 and Bi2S3 in an evacuated tube at 230°C for 48 hours;; sublimation in vacuum at 400°C;;	100%

aluminium(III) iodide (7784-23-8) + antimony triiodide (7790-44-5) → Al2Sb2I12

Conditions	Yield
In carbon disulfide exclusion of moisture; SbI3 and AlI3 (equimolar ratio) in CS2 are heated under reflux for 2 h; crystn. at room temp., complete at -20°C within 1 d;	100%

aluminium(III) iodide (7784-23-8) + 2-propanethiol (75-33-2) → aluminium triodide*2-propanethiol (98773-03-6)

Conditions	Yield
In benzene under N2, dropwise addn. of thiol soln. to a suspension of AlI3 in benzene, dissoln. of AlI3, stirred for 15 min at room temp.; evapn. of solvent, dried in vac. at room temp. for 3h, elem. anal.;	100%

1-thiopropane (107-03-9) + aluminium(III) iodide (7784-23-8) → aluminium triodide*1-propanethiol (98773-02-5)

Conditions	Yield
In benzene under N2, dropwise addn. of thiol soln. to a suspension of AlI3 in benzene, dissoln. of AlI3, stirred for 15 min at room temp.; evapn. of solvent, dried in vac. at room temp. for 3h, elem. anal.;	100%

Trimethyl(methylthio)silane (3908-55-2) + aluminium(III) iodide (7784-23-8) → aluminium triiodide*trimethylsilyl methyl sulphide (112908-17-5)

Conditions	Yield
In benzene a benzene soln. of Me3SiSMe was added dropwise under N2 to a suspn. of AlI3 in benzene, mixt. was stirred for 15 min at room temp.; solvent was evapd.; elem. anal.;	100%

aluminium(III) iodide (7784-23-8) + thiophenol (108-98-5) → aluminium triodide*ethanethiol (98773-01-4)

Conditions	Yield
In benzene under N2, dropwise addn. of thiol soln. to a suspension of AlI3 in benzene, dissoln. of AlI3, stirred for 15 min at room temp.; evapn. of solvent, dried in vac. at room temp. for 3h, elem. anal.;	100%

(ethylthio)trimethylsilane (5573-62-6) + aluminium(III) iodide (7784-23-8) → aluminium triiodide*trimethylsilyl ethyl sulphide (112908-18-6)

Conditions	Yield
In benzene a benzene soln. of Me3SiSEt was added dropwise under N2 to a suspn. of AlI3 in benzene, mixt. was stirred for 15 min at room temp.; solvent was evapd.; elem. anal.;	100%

tellurium + iodine (7553-56-2) + aluminium(III) iodide (7784-23-8) → TeI3(1+)*AlI4(1-)=TeI3[AlI4] (165602-57-3)

Conditions	Yield
In neat (no solvent) Ar atm.; molar ratio Te:I2:AlI3 1:2:1, heating (150-200°C, several hours);	100%

acridine (260-94-6) + bis(2,2,6,6-tetramethylpiperidino)aluminium iodide (194140-74-4) + aluminium(III) iodide (7784-23-8) → (2,2,6,6-tetramethylpiperidino)2Al(acridine) tetraiodoaluminate (211381-97-4)

Conditions	Yield
In dichloromethane inert atmosphere, addn. of soln. of acridine to soln. of piperidino compound at -78°C, -78°C (1 h), addn. of AlI3, slow warming toroom temp.; filtration, removement of volatiles (vacuum); elem. anal.;	99%

(2,2,6,6-tetramethylpiperidino)2AlI(isoquinoline) (211381-78-1) + aluminium(III) iodide (7784-23-8) → (2,2,6,6-tetramethylpiperidino)2Al(isoquinoline) tetraiodoaluminate (211381-95-2)

Conditions	Yield
In toluene inert atmosphere, addn. of soln. of AlI3 to soln. of piperidino compoundat 5-10°C, stirring (1.5 h); filtration, concn. of filtrate to dryness (vacuum); elem. anal.;	99%

bis(tricyclohexylphosphine)platinum(0) (55664-33-0) + aluminium(III) iodide (7784-23-8) → Pt(P(C6H11)3)2AlI3 (960294-96-6)

Conditions	Yield
In benzene AlBr3 was added to a soln. of Pt-complex in benzene, the soln. was kept at room temp. for 24 h;	99%

thallium(I) iodide + aluminium(III) iodide (7784-23-8) → Tl(1+)*AlI4(1-)=TlAlI4 (1208001-83-5)

Conditions	Yield
In neat (no solvent, solid phase) (Ar); solid state reaction; equimolar mixt. of TlI, and AlI3 sealed under vac. in glass ampoules; heated with 10°C/h to 150°C for 48 h; cooled to 25°C with 2.degre.C/h; detn. by XRD;	99%

hydrogen iodide (10034-85-2) + aluminium(III) iodide (7784-23-8) + 1,1,3,3-tetraphenyltrisilan (158875-67-3) → tetraiodotrisilane (192330-84-0)

Conditions	Yield
In benzene byproducts: C6H6; N2-atmosphere; passing hydrogen halide through soln. of silane contg. little Al-halide (gentle heating or cooling when necessary) to end of hydrogen halide consumption; evapn. (vac.), heptane addn., decantation from Al-halide, evapn.; elem. anal.;	98%

(1R,2R)-(-)-N,N'-bis(3,5-di-tert-butylsalicydene)-1,2-cyclohexanediaminocobalt(II) (176763-62-5) + aluminium(III) iodide (7784-23-8) → [AlI3(Co((R,R)-C6H10(NCHC6H2O(tert-butyl)2)2))]

Conditions	Yield
In dichloromethane; water addn. of Co(C6H10(NCHC6H2O(t-Bu)2)2) (1 equiv.) to soln. of AlI3 (1 equiv.) in CH2Cl2 and H2O; stirring at room temp. for 1 h; concn. under reduced pressure, treatment with H2O and CH2Cl2;	98%

1,1,2,2,3,3-hexaphenyltrisilane (18816-18-7) + hydrogen iodide (10034-85-2) + aluminium(III) iodide (7784-23-8) → I2HSiSiI2SiHI2 (192330-89-5)

Conditions	Yield
In benzene byproducts: C6H6; N2-atmosphere; passing hydrogen halide through soln. of silane contg. little Al-halide (gentle heating or cooling when necessary) to end of hydrogen halide consumption; evapn. (vac.), heptane addn., decantation from Al-halide, evapn.; elem. anal.;	97%

4-tert-butylpyridine (3978-81-2) + bis(2,2,6,6-tetramethylpiperidino)aluminium iodide (194140-74-4) + aluminium(III) iodide (7784-23-8) → AlI3(4-tert-butylpyridine) (211381-99-6)

Conditions	Yield
In hexane inert atmosphere, addn. of tert-butylpyridine to soln. of piperidino compound, addn. of AlI3 at room temp.; crystn. (overnight), filtration, washing (pentane); elem. anal.;	96%

2,2-dimethylpropylidynephosphine (78129-68-7) + aluminium(III) iodide (7784-23-8) → 2,4,6-tri-tert-butyl-1,5-diphospha-3-phosphoniaspiro[3.4]hexa-1,4-dien-6-yl triiodoaluminate

Conditions	Yield
In dichloromethane (argon); -78°C to room temp., stirring (2 h); removal of solvent (25°C/E-3 mbar);	95%

CH3NC(CH3)CHC(CH3)N(CH3)AlH2 (281654-50-0) + aluminium(III) iodide (7784-23-8) → C6H5NC(CH3)CHC(CH3)NC6H5AlI2 (420087-18-9)

Conditions	Yield
In dichloromethane under inert gas, 2 equiv. of Me3NHI was added to CH2Cl2 soln. of Al-complex at -20 °C., stirring for 3 h, warming up to room temp., stirring at room temp. for 8 h; solvent was removed in vac., residue was three times extd. with toluene,solvent was removed, solid was recrystd. from toluene/pentane at -30 .d egree.C, elem. anal.;	94%

hydrogen iodide (10034-85-2) + aluminium(III) iodide (7784-23-8) + 1,1,2,2-Tetraphenyl-trisilane (185988-25-4) → I2HSiSiI2SiH3 (192330-83-9)

Conditions	Yield
In benzene byproducts: C6H6; N2-atmosphere; passing hydrogen halide through soln. of silane contg. little Al-halide (gentle heating or cooling when necessary) to end of hydrogen halide consumption; evapn. (vac.), heptane addn., decantation from Al-halide, evapn.; elem. anal.;	94%

hydrogen iodide (10034-85-2) + aluminium(III) iodide (7784-23-8) + 1,1,2,2,3-Pentaphenyl-trisilane (192330-96-4) → I2HSiSiI2SiH2I (192330-86-2)

Conditions	Yield
In benzene byproducts: C6H6; N2-atmosphere; passing hydrogen halide through soln. of silane contg. little Al-halide (gentle heating or cooling when necessary) to end of hydrogen halide consumption; evapn. (vac.), heptane addn., decantation from Al-halide, evapn.; elem. anal.;	94%

methylthiol (74-93-1) + aluminium(III) iodide (7784-23-8) → aluminium triodide*methanethiol (98773-00-3)

Conditions	Yield
In benzene under N2, CH3SH introduced in a suspension of AlI3 for 7 min, dissoln. of AlI3, stirred for 15 min at room temp.; evapn., pptn., filtered, washed (hexane), dried in vac., elem. anal.;	93%

aluminium(III) iodide (7784-23-8) + lead bis(methylthiolate) (35029-96-0) → diiodo(methylthio)alane

Conditions	Yield
In benzene lead dithiolate was added to a suspn. of AlI3 in benzene under N2, mixt. was heated under reflux for 2 h; filtered, filtrate was concd., ppt. collected by filtration, washed with pentane, dried under high vac.; elem. anal.;	93%

aluminium(III) iodide (7784-23-8) + phosphorous triiodide (13455-01-1) → P2I5(1+)*AlI4(1-) = [P2I5][AlI4] (85887-16-7)

Conditions	Yield
In carbon disulfide (N2); stirring (room temp., 24 h); solvent removal (dynamic vac.);	92%

aluminium(III) iodide (7784-23-8) + acetone (67-64-1) → AlI3(acetone)2 (141997-44-6)

Conditions	Yield
In diethyl ether conventional Schlenk technique under dried Ar: addn. (dropwise) of 22mmol acetone in 10ml diethylether to a stirred, recently prepared, soln. of 10mmol AlI3 in 100ml diethylether, further stirring of mixture for 5min;; filtration, washing and drying in vacuo; elem. anal.;;	91%
In carbon disulfide conventional Schlenk technique under dried Ar: addn. of acetone to soln. of aluminium (III) iodide in carbondisulfide;; elem. anal.; 1H-NMR;;	>90

lead(II) ethyl sulfide (28420-40-8, 32812-83-2, 40597-30-6) + aluminium(III) iodide (7784-23-8) → diiodo(ethylthio)alane

Conditions	Yield
In benzene lead dithiolate was added to a suspn. of AlI3 in benzene under N2, mixt. was heated under reflux for 2 h; filtered, filtrate was concd., ppt. collected by filtration, washed with pentane, dried under high vac.; elem. anal.;	89%

tris(2,4,6-trimethylphenyl)phosphine (23897-15-6) + iodine (7553-56-2) + aluminium(III) iodide (7784-23-8) → [Mes3PI][AlI4] (1334609-05-0)

Conditions	Yield
In toluene under N2; stirred for 30 min; solvent removed (vac.), solid stirred in hexanes for 10 min, filtered onglass frit, washed with hexanes, dried;	89%

diphosphorus tetraiodide (13455-00-0) + iodine (7553-56-2) + aluminium(III) iodide (7784-23-8) → P2I5(1+)*AlI4(1-) = [P2I5][AlI4] (85887-16-7)

Conditions	Yield
In carbon disulfide (N2); stirring (room temp., 24 h); solvent removal (dynamic vac.);	88%

(2,2,6,6-tetramethylpiperidino)2AlI(pyridine) (211381-81-6) + aluminium(III) iodide (7784-23-8) → (2,2,6,6-tetramethylpiperidino)AlI2(pyridine) (211382-02-4)

Conditions	Yield
In toluene inert atmosphere, addn. of AlI3 to soln. of piperidino compound at 0°C, stirring (overnight); filtration, concn. to dryness (vacuum), crystn. (temperatures up to 35°C (several days, storage (1 week)), washing (pentane); elem. anal.;	88%

carbon dioxide (124-38-9) + tris(2,4,6-trimethylphenyl)phosphine (23897-15-6) + aluminium(III) iodide (7784-23-8) → Mes3P(CO2)(AlI3)2

Conditions	Yield
In further solvent(s) in bromobenzene; for 5 min; pptd. using hexanes, filtered, dried on a frit;	87%

Upstream product

• 7429-90-5 aluminium 
• 14693-81-3 tantalum pentaiodide 
• 7553-56-2 iodine 
• 56-81-5 glycerol 
• 10034-85-2 hydrogen iodide 
• 7783-86-0 ferrous iodide 

Downstream Products

• 130200-58-7 7-hydroxynaphthalene-2-carbonitrile 
• 1333-84-2 aluminum oxide 
• 7787-64-6 bismuth(III) iodide 
• 13569-75-0 chromium(III) iodide 
• 10034-85-2 hydrogen iodide 
• 13517-10-7 boron triiodide 
• 201230-82-2 carbon monoxide 
• 7553-56-2 iodine 
• 13779-92-5 niobium(V) iodide 
• 14693-81-3 tantalum pentaiodide 
• 182321-38-6 aluminum phosphide 
• 1112-49-8 triethylsilyl iodide 
• 194140-74-4 bis(2,2,6,6-tetramethylpiperidino)aluminium iodide 
• 819799-72-9 Mo(N((t)Bu)(C₆H₃-3,5-Me₂))3NAlI₃ 

Relevant academic research and scientific papers

Synthesis, structure and characterization of [Mg7(μ3-OCH2CH2OMe)6(μ-OCH2CH2OMe)6][Al(n-Bu)4]2 - A cationic heptanuclear magnesium complex consisting of discrete cations and tetrabutylaluminate anions

Dibutylmagnesium (contaminated with Al(n-Bu)3; nMg:nAl ca. 1:0.2) was found to react with MeOCH2CH2OH followed by the addition of PhSCH(Me)Ph in the presence of 0.2 equiv n-butyllithium yielding [Mg7(μ3-OCH2CH2OMe)6(μ-OCH2CH2OMe)6][Al(n-Bu)4]2 (1) as the principal product (yield 40-45% referred to MeOCH2CH2OH). The single-crystal X-ray diffraction analysis revealed that the centrosymmetric cationic heptamagnesium complex is built up from seven edge-shared MgO6 octahedra. The [Al(n-Bu)4]- anions adopt approximately a tetrahedral AlC4 symmetry. 1H, 13C and 27Al NMR spectroscopic measurements showed that in THF solution the structures both of the heptamagnesium complex and the tetrabutylaluminate anion are preserved and that there are no cation-anion interactions reducing the symmetry. The 27Al resonance (151.6 ppm) was found to be very sharp (w1/2 = 5 Hz), the coupling constant 1J(27Al,13C) amounts to 72.3 Hz.

Vaporization and thermal decomposition of the AlI3Py adduct

Vaporization of the AlI3Py adduct was studied by mass-spectrometry and tensimetry. Thermodynamic characteristics of vaporization and gas-phase dissociation of the complex were determined.

Cheap and environmentally benign electrochemical energy storage and conversion devices based on AlI3 electrolytes

Cheap and environmentally benign electrochemical energy conversion and storage devices, including a dye-sensitized solar cell (DSSC) using an AlI3-ethanol electrolyte and a new Al/I2 primary battery, are reported. The AlI3-ethanol electrolyte can be prepared simply by adding aluminum powder and iodine into ethanol at ambient conditions. The DSSC using this AlI3-ethanol electrolyte achieved an energy conversion efficiency of 5.9% at AM 1.5 (100 mW/cm-2). In the Al/I2 battery, AlI3is formed spontaneously when aluminum and iodine electrodes are brought into contact at room temperature. Then I- anions transport across the AlI3 solid electrolyte for further electrochemical reactions. Copyright

Rapid solid-state metathesis routes to aluminum nitride

Metathesis (exchange) reactions offer the possibility of controlling temperature through a judicious choice of precursors. Here, a reaction between AlCl3 and Ca3N2 is found to produce phase-pure aluminum nitride (AIN) in seconds. The CaCl2 byproduct salt, whose formation drives this highly exothermic reaction, is simply washed away after reaction completion. SEM images demonstrate that the AIN product is a micron-sized powder, while TEM shows well-formed crystallites. Thermodynamic calculations indicate that a reaction temperature of 2208 K could be reached under adiabatic conditions. Using an in situ thermocouple and a stainless steel reactor vessel to hold the precursors, a reaction temperature of 1673 K is measured 0.8 s after initiation. Switching to a thermally insulating ceramic vessel produces a maximum reaction temperature of 2010 K because of the more nearly adiabatic conditions. The high reaction temperature appears to be critical to forming phase-pure AIN. Experiments with Li3N, instead of Ca3N2, produce lower temperatures (1513 K), resulting in both Al and Al2O3 impurities.

Chemical synthesis of aluminum nitride nanorods in an autoclave at 200 °C

Hexagonal phase aluminum nitride (AlN) nanorods have been prepared via a chemical reaction from Al, I2, and NaN3 in an autoclave at 200°C. Electron microscopy investigations show that the nanorods have diameters ranging from 50 to 100nm and lengths up to several micrometers. Thermal gravimetric analysis reveals that the sample has good thermal stability below 600°C, and room-temperature photoluminescence (PL) of the sample shows a strong emission peak centered at 397 nm. Copyright

Dimeric Di(tert-butyl)haloalanes and a Monomeric Di(tert-butyl)phosphino- di(tert-butyl)alane

The di(tert-butyl)aluminum halides, tBu2AlX (X = Br, I) have been prepared in yields ranging from 55 to 64 % from AlX3 and Lit Bu in a 1: 2 molar ratio in pentane. In the crystal these pyrophoric compounds are dimeric featuring Al-X-Al bridges. The reaction of AlCI3 with LitBu in diethyl ether produced a volatile solvate of composition tBu3Al-Cl- AltBu2(OEt2). Reaction of this species with AlCl 3 at 120 °C yielded a separable mixture of tBu2AlCl and tBu2AlCl(OEt2). tBu2AlCl and tBu 2GaCl react with tBu2PLi to produce the monomeric compounds tBu2E-PtBu2 (E = Al, Ga). The aluminum compound decomposes at 111 °C to give a mixture of the cis/trans-isomers of [tBu(H) Al-PtBu2]2 while at 200 °C only the trans-isomer is formed.

Thermodynamic data of the dimerisation of gaseous CrI2(g), MnI2(g), FeI2(g), and CoI2(g), experimental and quantum chemical investigations

By means of quantum chemical methods molar heats and entropies as a function of temperature for the monomeric and dimeric diiodides of 3d-metals have been calculated. From mass-spectrometric measurements of the dimerisation equilibria of gaseous CrI2, MnI2, FeI2, and CoI2 using the Knudsen-effusion method the heats of dimerisation and the heats of formation of the monomeric and dimeric iodides could be derived using the results of the quantum chemical calculations. WILEY-VCH Verlag GmbH, 2001.

Phase Relations and Intermediate Phases in the Al-Te System

The binary system Al-Te contains the intermediate phases AlTe (m.p. 857 deg C, syntectic), Al2Te3 (α-phase stable up to 720 deg C; β-phase: m.p. 903 deg C, congruent) and Al2Te5 (stable between 415 deg C and 465 deg C, incongruent).The crystal structure of α-Al2Te3 is monoclinic (super-structure: a = 41.565(8) Angstroem, b = 7.189(1) Angstroem, c = 25.477(7) Angstroem, β = 90.21(2) deg, Z = 48, Dx = 4.57 g/cm3).Te positions of the sub-cell (monoclinic P21: a/3, b, c/6, β) were determined by direct methods: Te atoms are arranged in close-packed layers which are stacked along with the sequence ABCBA.A metastable cubic phase of composition Al2Te3 (Zinc blende-type-structure: a = 5.949(1) Angstroem; Al with random distribution) is obtained by thermal decomposition of ternary compounds AlTeX (X = Cl, Br, I). - Keywords: Phase Relations, Crystal Structure, Binary Compounds

Sinthesis and High-Pressure Behaviour of Quaternary Chalcogenide Halides M2M'X3Y (M = Zn, Cd; M' = Al, Ga, In; X = Se, Te; Y = Cl, Br, I)

Quaternary chalcogenide halides M2M'X3Y (M = Zn, Cd; M' = Al, Ga, In; X = Se, Te; Y = Cl, Br, I) can be synthesized by heating stoichiometric amounts of the binary components MX, MY2, and M'2X3 in evacuated sealed quartz ampoules.In the case of aluminium and gallium compounds, a mixture of the M' and X elements rather than the binary compounds has been used.The products are typical tetrahedral compounds, crystallizing with either the defect wurtzite-type or the defect zinc-blende-type structure.At 25 kbar, and 1400 deg C, Cd2InSe3Cl, Cd2InSe3Br, and Cd2InSe3I transform from the defect wurtzite-type structure to quenchable high-pressure phases with defect NaCl-type structure.The retransformation to the ambient-pressure phases proceeds via intermediates having the defect zinc-blende-type structure.Some aspects of the apparent nonstoichiometry in the high-pressure phases are discussed. - Keywords: Quaternary Chalcogenide Halides, Synthesis, Crystal Structure, High-Pressure Reactions

Vibrational spectroscopy and normal coordinate analysis of μ halo hexahalodialuminates ions Al2X7- (X = Cl, Br, I) in some salts and in Friedel-Crafts solutions

Infrared and Raman spectra are reported for (Me4N)Al2Cl7, (Et4N)Al2Cl7, KAl2Br7 and CsAl2I7 in the solid state at ordinary temperature.An assignment for practically all the vibrational modes is proposed for the three ions Al2Cl7-, Al2Br7- and Al2I7-.To elucidate the species occurring in the Friedel-Crafts liquids , the spectra of these solutions were also recorded.The quasi identity of the halogenide part of the spectra with the previous one leads to the unique formulation ArH2+Al2X7- for these solutions, in these cases the Al2X7- ion appears at a higher local symmetry of the AlX3 groups than in the solid state.An approximate valence force field calculation confirms the assignments.It also shows the transferability of force constants for a X-AlX3 model.Spectroscopic particularities are explained in terms of different coupling between bridged and terminal stretching modes.