7727-15-3

Basic information

• Product Name: Aluminum bromide
• Synonyms: Aluminumbromide (8CI);Aluminum tribromide;Aluminum tribromide (AlBr3);NSC 87608;Aluminum bromide(AlBr3)
• CAS NO: 7727-15-3
• Molecular Formula: AlBr₃
• Molecular Weight: 266.693538
• EINECS: 231-779-7
• Mol File: 7727-15-3.mol
• Article Data: 11

Chemical Properties

• Melting Point: 97℃
• Boiling Point: 265 °C
• Flash Point: 268°C subl.
• Appearance: white crystalline powder
• Density: 3.205 g/mL at 25 °C(lit.)
• Water Solubility: decomposes
• CAS DataBase Reference: Aluminum bromide(CAS DataBase Reference)
• NIST Chemistry Reference: Aluminum bromide(7727-15-3)
• EPA Substance Registry System: Aluminum bromide(7727-15-3)

Safety Data

• Hazard Codes: C:Corrosive
• Statements: R22:; R34:
• Safety Statements: S36/37/39:
• Hazardous Substances Data: 7727-15-3(Hazardous Substances Data)

Usage

General Description

Aluminum bromide is a chemical compound with the formula AlBr3. It is a white solid that is highly reactive, particularly in the presence of water. Aluminum bromide is used in organic synthesis as a catalyst for various reactions, such as isomerization and alkylation. It can also be used in the production of dyes and pharmaceuticals. Due to its hygroscopic nature, aluminum bromide must be handled carefully, as it can cause severe burns upon contact with skin and mucous membranes. Additionally, it has been found to have potential health and environmental hazards, and therefore, strict safety precautions must be taken when handling and disposing of this compound.

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

Synthetic route

phenylaluminium dichloride (3530-39-0) + allyl bromide (106-95-6) → allylbenzene (300-57-2) + biphenyl (92-52-4) + aluminium bromide (7727-15-3)

Conditions	Yield
bis(η3-allyl-μ-chloropalladium(II)) In diethyl ether Ar atmosphere; stirring (20°C, 5 mole-% catalyst, 8 h);	A 94% B <1 C n/a
tetrakis(triphenylphosphine) palladium(0) In diethyl ether Ar atmosphere; stirring (20°C, 5 mole-% catalyst, 20 h);	A <1 B <1 C n/a

diphenylaluminum chloride (6591-30-6) + allyl bromide (106-95-6) → allylbenzene (300-57-2) + biphenyl (92-52-4) + aluminium bromide (7727-15-3)

Conditions	Yield
tetrakis(triphenylphosphine) palladium(0) In diethyl ether Ar atmosphere; stirring (20°C, 5 mole-% catalyst, 20 h);	A 37% B <1 C n/a

1,1-dibromomethane (74-95-3) + aluminium → ethene (74-85-1) + aluminium bromide (7727-15-3)

Bromoform (75-25-2) + aluminium → aluminium bromide (7727-15-3)

Conditions	Yield
Erhitzen des Reaktionsprodukts im Vakuum auf 200grad;

aluminum oxide (1333-84-2, 1344-28-1) → aluminium bromide (7727-15-3)

Conditions	Yield
With bromine; pyrographite In not given heating;
With bromine; pyrographite heating;
With sulfur dibromide In solid 350°C, with vaporous sulfur bromide;

aluminum oxide (1333-84-2, 1344-28-1) + disulphur dibromide (13172-31-1) → aluminium bromide (7727-15-3)

Conditions	Yield
reaction started at 350°C and accelerated by raising of temp.; excess of S2Br2 removed with HBr or nitrogen;
reaction started at 350°C and accelerated by raising of temp.; excess of S2Br2 removed with HBr or nitrogen;

bromine (7726-95-6) → aluminium bromide (7727-15-3)

Conditions	Yield
With aluminum(III) sulfate In water heating on water bath with small amt. of Br2 and H2O;
With bisilicates; carbon heating;
With carbon; silicates heating;

aluminium trinitrate (7784-27-2) + bromine (7726-95-6) → aluminium bromide (7727-15-3)

Conditions	Yield
In not given heating on water bath with small amt. of Br2;
In not given heating on water bath with small amt. of Br2;

bromine (7726-95-6) + aluminium (7429-90-5) → aluminium bromide (7727-15-3)

Conditions	Yield
In gas Al and Br2 in vac. were vaporized separately and reacted in gaseous state; distd. in vac.;
With air; water in moist air containing Br2 condensation of droplets of a soln. of AlBr3 occurs on a gray layer that has formed first;;
In neat (no solvent) start of react. by heating;;

aluminium (7429-90-5) → aluminium bromide (7727-15-3)

Conditions	Yield
With bromine reacted in the presence of AlBr3;
With bromine Al heated in combustion tube; with H2 or N2 deluted Br2 lead over Al;
With bromine Al sheet heated in combustion tube; vaporous Br2 leaded over Al; AlBr3 flowed out from tube;

ethylene dibromide (106-93-4) + aluminium (7429-90-5) → ethene (74-85-1) + aluminium bromide (7727-15-3)

Conditions	Yield
In ethylene dibromide
In ethylene dibromide

stannic bromide (7789-67-5) + aluminium (7429-90-5) → aluminium bromide (7727-15-3)

Conditions	Yield
In not given heating of Al with SnBr4 for 30 min gives AlBr3;;

tin(II) bromide + aluminium (7429-90-5) → aluminium bromide (7727-15-3)

Conditions	Yield
In neat (no solvent) reaction with SnBr2 under formation of AlBr3 above 216°C;; differentialthermoanalytic examinations;;

aluminium (7429-90-5) + mercury dibromide → mercury(I) bromide + aluminium bromide (7727-15-3) + mercury

Conditions	Yield
at higher temp.;;

AlBr3*Br4*CS2 → aluminium bromide (7727-15-3)

Conditions	Yield
byproducts: Br2, CS2; decompn. at 150°C;
byproducts: Br2, CS2; decompn. at 150°C;

2AlBr3*Br4*CS2 → CS2Br4 + aluminium bromide (7727-15-3)

Conditions	Yield
at 200°C;
at 200°C;

bromocyane (506-68-3) + aluminium (7429-90-5) → aluminium bromide (7727-15-3)

Conditions	Yield
120°C;
120°C;

zinc(II) selenide + AlSeBr → Zn2AlSe3Br + aluminium bromide (7727-15-3)

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, AlBr3 sublimates off;	A 0% B n/a

phosphorus tribromide (7789-60-8) + aluminium (7429-90-5) → phosphorous + aluminium bromide (7727-15-3)

Conditions	Yield
In neat (no solvent) reaction at 100°C;;
In neat (no solvent) reaction at 100°C;;

bromine (10097-32-2) → aluminium bromide (7727-15-3)

Conditions	Yield
With sulfur introducing a vapor of a soln. of S in Br2 over Al oxide;
With S introducing a vapor of a soln. of S in Br2 over Al oxide;

AsBr4(1+)*AlBr4(1-)={AsBr4}{AlBr4} (119484-32-1) → bromine (7726-95-6) + aluminium bromide (7727-15-3) + arsenic(III) bromide (7784-33-0)

Conditions	Yield
equilibrium at room temp.;

lithium{aluminum-bromo(μ-dibromo)-tetrakis(tert-butoxy)titanate} → titanium(IV) tetrabutoxide + aluminium bromide (7727-15-3)

Conditions	Yield
With copper(l) chloride In tetrahydrofuran byproducts: Cu, LiCl; to a soln. of Ti-complex in THF at 0°C is added CuCl; pptn. of Cu, solvent is removed in vac., the residue is dissolved in toluene, pptd. LiCl is centrifuged off, the soln. is vacuum-evaporated, from the residue at 90-110°C is distilled the complex, crystn. at 20°C, elem. anal.;

{(CO)3Fe(P(C6H5)3)2Br}(1+)*AlBr4(1-)={(CO)3Fe(P(C6H5)3)2Br}AlBr4 → tricarbonyl bis(triphenylphosphine) iron (14741-34-5, 21255-52-7) + bis(triphenylphosphine)dicarbonyldibromoiron(II) (51744-69-5, 15020-31-2, 84622-99-1) + bromine (7726-95-6) + aluminium bromide (7727-15-3)

Conditions	Yield
In tetrahydrofuran	A <1 B n/a C n/a D n/a
In methanol	A <1 B n/a C n/a D n/a
In dichloromethane	A <1 B n/a C n/a D n/a

tetraiodophosphonium tetrabromoaluminate (361447-05-4) → aluminium bromide (7727-15-3) + iodine(I) bromide (7789-33-5) + phosphorous triiodide (13455-01-1)

Conditions	Yield
In carbon disulfide under N2, anaerobic and anhyd. conditions; dissolved in CS2;

dibromo[3-(dimethylamino)propyl]aluminium → aluminium(I) bromide (22359-97-3) + AlBr2 (136684-48-5) + hydrogen isocyanide (74-90-8, 6914-07-4) + aluminium bromide (7727-15-3) + dibromoaluminium hydride

Conditions	Yield
In neat (no solvent, gas phase); solid matrix byproducts: CH4, H2C=CH2, H2C=CHCH3; N2 atmosphere, high vacuum (1E-6 to 1E-7 mbar) thermolysis at 1000°C, trapping in argon at 15 K; further organic byproducts: H2C=N(CH3)2 and H2CCHCH2; IR-monitoring;

aluminum bromide fluoride → aluminium(III) fluoride (7784-18-1) + aluminium bromide (7727-15-3)

Conditions	Yield
In solid heating at 400°C;

lithium aluminium tetrahydride (16853-85-3) + non-1-ene (124-11-8) + aluminium bromide (7727-15-3) → 1-dibromoaluminiononane (180334-67-2)

Conditions	Yield
In diethyl ether; benzene Ar, LiAlH4 in ether added to benzene under stirring, most of the solvent removed, benzene and AlBr3 in benzene added, stirred at 20°C for 1 h, org. compound in benzene added dropwise under stirring, warmed to30-40°C for 5-10 min; NMR;	100%

aluminium bromide (7727-15-3) + (2-methylpropyl)lithium (920-36-5, 90269-51-5) + magnesium bromide → magnesium tetra(isobutyl)aluminate

Conditions	Yield
In hexane; toluene byproducts: LiBr; to stirred mixt. of MgBr2, AlBr3 and toluene at room temp., soln. of iso-C4H9Li in hexane added (Ar; ratio MgBr2, AlBr3, RLi: 1:2:8) within 20 min; react. for 3.0 h at 80°C; ppt. filtered off (Ar); (1)H NMR of soln.;	100%

aluminium bromide (7727-15-3) + thiophenol (108-98-5) → aluminium tribromide*ethanethiol (98772-99-7)

Conditions	Yield
In benzene under N2, dropwise addn. of thiol soln. to a suspension of AlBr3 in benzene, dissoln. of AlBr3, stirred for 15 min at room temp.; evapn. of solvent, dried in vac. at room temp. for 3h, elem. anal.;	100%

(1,1';3',1''-terphenyl)-2'-ol (2432-11-3) + aluminium bromide (7727-15-3) → aluminium tris(2,6-diphenylphenoxide)

Conditions	Yield
With tetraallyltin In benzene byproducts: SnBr4, propene; 2,6-diphenylphenol (12 equiv.) treated with AlBr3 (4 equiv.) in benzene at room temp., tetraallyltin (3 equiv.) added, stirred at room temp. for1 h, solvent evapd. in vacuo for 3 h with concomitant removal of SnBr4 and propene;	100%

methylthiol (74-93-1) + aluminium bromide (7727-15-3) → aluminium tribromide*methanethiol (98772-98-6)

Conditions	Yield
In benzene under N2, CH3SH introduced in a suspension of AlBr3 for 7 min, dissoln.of AlBr3, 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 bromide (7727-15-3) → aluminium tribromide*trimethylsilyl methyl sulphide (112908-14-2)

Conditions	Yield
In benzene a benzene soln. of Me3SiSMe was added dropwise under N2 to a suspn. of AlBr3 in benzene, mixt. was stirred for 15 min at room temp.; solvent was evapd.; elem. anal.;	100%

(ethylthio)trimethylsilane (5573-62-6) + aluminium bromide (7727-15-3) → aluminium tribromide*trimethylsilyl ethyl sulphide (112908-15-3)

Conditions	Yield
In benzene a benzene soln. of Me3SiSEt was added dropwise under N2 to a suspn. of AlBr3 in benzene, mixt. was stirred for 15 min at room temp.; solvent was evapd.; elem. anal.;	100%

phenylthiotrimethylsilane (4551-15-9) + aluminium bromide (7727-15-3) → aluminium tribromide*trimethylsilyl phenyl sulphide (112908-16-4)

Conditions	Yield
In benzene a benzene soln. of Me3SiSPh was added dropwise under N2 to a suspn. of AlBr3 in benzene, mixt. was stirred for 15 min at room temp.; solvent was evapd.; elem. anal.;	100%

disupersilyl aluminum bromide + aluminium bromide (7727-15-3) → supersilylaluminum dibromide (374569-92-3)

Conditions	Yield
In n-heptane Kinetics; all manipulations with exclusion of air and moisture; compd. prepd. fromAlBr3 and org. compd. reacted in molar ratio of 1:1 at room temp. for 2 4 d (yield depended on react. time); controlled by NMR; volatiles evapd. by oil pump, residue dissolved in heptane, NaBr filtered;	100%

selenium tetrabromide (7789-65-3) + aluminium bromide (7727-15-3) → tribromoselenium(IV) tetrabromoaluminate (69951-93-5)

Conditions	Yield
In neat (no solvent) Ar atm. (300 mbar); heating (150-200°C, several days);	100%
In dichloromethane addn. of AlBr3 to SeBr4, stirring (2 h); filtration (under dry N2), drying (vac.); elem. anal.;

(S)-3,3-bis(3,5-dimethylphenyl)-1-(2,4,6-trifluorophenyl)tetrahydro-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaborole + aluminium bromide (7727-15-3) → (S)-3,3-bis(3,5-dimethylphenyl)-1-(2,4,6-trifluorophenyl)tetrahydro-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaborol-7-ium-7-yltribromoaluminate

Conditions	Yield
In dichloromethane; ethylene dibromide	100%

(S)-3,3-bis(2,3-dimethylphenyl)-1-(2,4,6-trifluorophenyl)tetrahydro-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaborole + aluminium bromide (7727-15-3) → C27H27AlBBr3F3NO

Conditions	Yield
In dichloromethane; ethylene dibromide	100%

WH2(η-cyclopentadienyl)2 + aluminium bromide (7727-15-3) → bis(η5-cyclopentadienyl)tungsten dihydride * AlBr3 (79560-37-5)

Conditions	Yield
In diethyl ether stoich. amts. (pptn.);	99%

bis(tricyclohexylphosphine)platinum(0) (55664-33-0) + aluminium bromide (7727-15-3) → [(Cy3P)2Pt(AlBr3)] (960294-94-4)

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%
In toluene (Ar); Al salt added to a soln. of Pt complex; evapd. (vac.); elem. anal.;	98%

thallium(I) bromide + aluminium bromide (7727-15-3) → Tl(1+)*AlBr4(1-)=TlAlBr4 (114064-41-4)

Conditions	Yield
In neat (no solvent, solid phase) (Ar); solid state reaction; equimolar mixt. of TlBr, and AlBr3 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%

1,2-dimethoxyethane (110-71-4) + aluminium bromide (7727-15-3) → aluminium tribromide-1,2-dimethoxyethane (182561-85-9)

Conditions	Yield
In toluene (N2); stirring (1 h); filtration, washing (toluene); elem. anal.;	98.7%

aluminium bromide (7727-15-3) + sodium triethoxysilanolate (53201-03-9) → tris(triethoxysiloxy)aluminum + sodium bromide (7647-15-6)

Conditions	Yield
In benzene (glovebox); addn. of a soln. of AlBr3 in C6H6 to a soln. of silicon compd. in C6H6 in vac. with stirring, sealing, heating to 40°C for 30min with shaking; centrifugation, decantation, evapn; elem. anal.;	A 98% B 98%

(1R,2R)-(-)-N,N'-bis(3,5-di-tert-butylsalicydene)-1,2-cyclohexanediaminocobalt(II) (176763-62-5) + aluminium bromide (7727-15-3) → [AlBr3(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 AlBr3 (1 equiv.) in CH2Cl2/H2O; stirring at room temp. for 1 h; concn. under reduced pressure, treatment with H2O and CH2Cl2;	98%

[(S,S)-Carbox-iPr]H + aluminium bromide (7727-15-3) → (S,S)-1,7-bis(1-bromo-3-methylbutanamide-2-yl)-1,7-dicarba-closo-dodecaborane

Conditions	Yield
With I2 In dichloromethane a mixt. of B compd., I2, and AlBr3 in CH2Cl2 refluxed for 16.5 h under N2; poured into ice-cold H2O, the org. phase sepd., the aq. layer extd. (Et2O), the combined org. phase washed (Na2S2O3 soln., then H2O), dried (MgSO4), solvent-removed, recrystd. (hexane); elem. anal.;	98%

tetrahydrofuran (109-99-9) + N,N-bis(2-hydroxy-3,5-di-tert-butylphenyl)amine (97355-16-3) + aluminium bromide (7727-15-3) → [bis(3,5-di-tert-butyl-2-phenol)amine(2-)]AlBr(THF) (1384526-06-0)

Conditions	Yield
With KH In tetrahydrofuran under inert atm. mixt. ligand and KH in THF were stirred at room temp. for 2 h, soln. was frozen, AlBr3 was added upon thawing, stirred at room temp. overnight; solvent was removed in vacuo, residue was co-evapd. with pentane; elem. anal.;	98%

dimethylacetylene (503-17-3) + aluminium bromide (7727-15-3) → C4(CH3)4*AlBr3 (70492-15-8)

Conditions	Yield
In methyl cyclohexane addn. of 2-butyne to soln. of AlBr3, 0°C, stirred 15h at 25°C, filtered, washed with methylcyclohexane, dried in vac.; elem. anal.;	97%

dicobalt octacarbonyl (15226-74-1, 61091-28-9, 61117-58-6) + aluminium bromide (7727-15-3) → Co2(CO)8*AlBr3

Conditions	Yield
In n-heptane room temp.;	97%
In benzene room temp.;	97%
In benzene room temp.;	97%

aluminium bromide (7727-15-3) + (pentafluoro phenyl) methyl mercury (653-38-3) → (pentafluoro phenyl) dibromo alane (4457-90-3)

Conditions	Yield
In neat (no solvent) heating of the components ( molar ratio 1 : 1) in a closed tube at 70°C, 5 days;;	97%

uranium dioxide + aluminium bromide (7727-15-3) → uranium(IV) bromide (13470-20-7)

Conditions	Yield
Stage #1: uranium dioxide; aluminium bromide at 250℃; for 12h; Sealed tube; Stage #2: at 350℃; for 144h; Sealed tube;	97%

lithium aluminium tetrahydride (16853-85-3) + camphene (79-92-5) + aluminium bromide (7727-15-3) → C10H17AlBr2

Conditions	Yield
In diethyl ether; benzene Ar, LiAlH4 in ether added to benzene under stirring, most of the solvent removed, benzene and AlBr3 in benzene added, stirred at 20°C for 1 h, org. compound in benzene added drowise under stirring, warmed to 30-40°C for 5-10 min; NMR;	96%

1,3-dimethyl-2-dimethylaminodiazaborolane (26944-84-3) + aluminium bromide (7727-15-3) → 1,3-dimethyl-2-(dimethylamino)-1,3,2-diazaborolidine-1,3-bis(aluminum-tribromide)

Conditions	Yield
under N2, at -78°C; excess of Lewis-acid used; elem. anal.;	96%

2-Phenoxyethanol (122-99-6) + aluminium bromide (7727-15-3) → [(μ-2-phenoxyethanolate)AlBr2]2 (223647-11-8)

Conditions	Yield
In toluene N2-atmosphere; slow addn. of Al-salt to slight excess of alcohol at 25°C, stirring for 4 h; drying (vac.), extn. into CH2Cl2, drying (vac.); elem. anal.;	96%

potassium triethoxysilanolate (168292-74-8) + aluminium bromide (7727-15-3) → potassium tetrakis(triethoxysiloxy)aluminates + potassium bromide (7558-02-3)

Conditions	Yield
In benzene (glovebox); dropwise addn. of a soln. of AlBr3 in C6H6 to a soln. of silicon compd. in C6H6 over 15 min with stirring, refluxing for 7 h; centrifugation, decantation, evapn.; elem. anal.;	A 88% B 96%

(2,2,6,6-tetramethylpiperidino)2AlBr(isoquinoline) (211381-77-0) + aluminium bromide (7727-15-3) → (2,2,6,6-tetramethylpiperidino)2Al(isoquinoline) tetrabromoaluminate (211381-88-3)

Conditions	Yield
In Bromoform inert atmosphere, addn. of soln. of AlBr3 to soln of isoquinoline complex at 0°C, 30 min; reduction of volume, crystn. (-20°C, overnight); elem. anal.;	96%

lithium aluminium tetrahydride (16853-85-3) + 2,4-dimethyl-2-pentene (625-65-0) + aluminium bromide (7727-15-3) → (CH3)2CHCH(AlBr2)CH(CH3)CH3 (180334-71-8)

Conditions	Yield
In diethyl ether; benzene Ar, LiAlH4 in ether added to benzene under stirring, most of the solvent removed, benzene and AlBr3 in benzene added, stirred at 20°C for 1 h, org. compound in benzene added drowise under stirring, warmed to 30-40°C for 5-10 min; NMR;	96%

Upstream product

• 75-25-2 Bromoform 
• 361447-05-4 tetraiodophosphonium tetrabromoaluminate 
• 6591-30-6 diphenylaluminum chloride 
• 106-95-6 allyl bromide 
• 3530-39-0 phenylaluminium dichloride 
• 119484-32-1 AsBr₄⁽¹⁺⁾*AlBr₄^(1-)={AsBr₄}{AlBr₄} 
• 10097-32-2 bromine 
• 7789-60-8 phosphorus tribromide 
• 7429-90-5 aluminium 
• 506-68-3 bromocyane 
• 7789-67-5 stannic bromide 
• 106-93-4 ethylene dibromide 
• 7726-95-6 bromine 

Downstream Products

• 99855-09-1 2-(4-ethoxyphenyl)-4,5-dihydro-1H-oxazole 
• 15969-09-2 2,4-dibromo-6-nitrophenol 
• 87-83-2 pentabromotoluene 
• 608-71-9 Pentabromophenol 
• 13343-26-5 phenyl p-chlorophenyl sulfide 
• 95-46-5 2-methylphenyl bromide 
• 22077-56-1 di-2-tolyl selenide 
• 857624-07-8 chloro-acetic acid-(2,6-dibromo-anilide) 
• 109-70-6 1.3-chlorobromopropane 
• 109-64-8 1,3-dibromo-propane 
• 74-86-2 acetylene 
• 123-73-9 crotonaldehyde 
• 576-83-0 2,4,6-trimethylphenyl bromide 
• 108-86-1 bromobenzene 

Relevant articles and documents

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.

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.

Amorphous aluminum bromide fluoride (ABF)

Different octahedral units form the basis of the structures of the very strong Lewis acids aluminum bromide fluoride (ABF) and aluminum chloride fluoride (ACF) (see picture). A structure model for these phases is established in which the octahedra are linked through μ-bridging fluorine atoms and μ3-bridging X atoms (X = Cl, Br). The bridging of three octahedra by a heavy halogen atom explains the results of NMR and EXAFS analysis.