22756-36-1

Basic information

• Product Name: Rubidium azide
• Synonyms: Rubidium azide
• CAS NO: 22756-36-1
• Molecular Formula: N₃*Rb
• Molecular Weight: 127.4879
• Mol File: 22756-36-1.mol

Chemical Properties

• Melting Point: 317°C
• Boiling Point: °Cat760mmHg
• Flash Point: °C
• Appearance: /tetragonal crystals
• Density: 2.790
• Water Solubility: 107g/100mL H2O (16°C) [CRC10]
• CAS DataBase Reference: Rubidium azide(CAS DataBase Reference)
• NIST Chemistry Reference: Rubidium azide(22756-36-1)
• EPA Substance Registry System: Rubidium azide(22756-36-1)

Safety Data

• Hazardous Substances Data: 22756-36-1(Hazardous Substances Data)

Usage

Chemical Properties

colorless needles; tetr, a=0.636 nm, c=0.741nm [CRC10] [CIC73]

Hazard

A poison by ingestion. May be unstable, especially when heated.

InChI:InChI=1/N3.Rb/c1-3-2;/q-1;+1

Synthetic route

nitrogen (7727-37-9) + rubidium → rubidium azide (22756-36-1) + rubidium nitride

Conditions	Yield
In neat (no solvent) fast and complete react. of Rb vapour and elec. activated N2 at 60-70°C;;
In neat (no solvent) react. of elec. activated nitrogen with Rb (drops); formation of Rb3N by decompn. of RbN3;; small amt. of Rb3N;;
In neat (no solvent) react. of activated nitrogen with Rb mirror;;

sodium azide + rubidium chloride → rubidium azide (22756-36-1)

Conditions	Yield
In water ion-exchange procedure; volune reduction (353 K), pptn. on EtOH addn.;
With Ionenaustauscher III(OH(1-)) In water loading anion exchange resin with N3(1-) ions using column technique and0.1 N aq. soln. of NaN3, passing aq. soln. of RbCl through the column; evapn. in vac.; X-ray diffraction anal.;

rubidium carbonate + sodium azide → rubidium azide (22756-36-1)

Conditions	Yield
In water NaN3 treated in acidic cation-exchange resin column; HN3 eluate dripped in Rb2CO3 soln. with rate of 5 mL/min; water evapd.; detd. by Raman spectroscopy;
In water mixt. of Rb2CO3 and NaN3 in water; pptn. of RbN3, filtration, washing with 70% ethanol, recrystn., drying in exsiccator over CaCl2 and in vac.;
With acidic cation exchanger In water ion-exchange method;

rubidium sulfate + barium azide → rubidium azide (22756-36-1)

Conditions	Yield
In water recrystn.;;

rubidium hydride + nitrogen (7727-37-9) → rubidium azide (22756-36-1) + rubidium amide (12141-27-4)

Conditions	Yield
In neat (no solvent) on weak heating with dry N2;; mixt. of RbN3 and RbNH2 obtained;;
In neat (no solvent) on weak heating with dry N2;; mixt. of RbN3 and RbNH2 obtained;;

nitrogen (7727-37-9) + rubidium → rubidium azide (22756-36-1)

Conditions	Yield
In neat (no solvent) react. of elec. activated nitrogen with Rb (drops);;
In neat (no solvent) react. of elec. activated nitrogen with Rb (drops);;

rubidium carbonate + barium azide → rubidium azide (22756-36-1)

Conditions	Yield
In water solns. mixed in 1:1 mol. ratio; filtered, recrystd.;

rubidium carbonate + hydrogen azide → rubidium azide (22756-36-1)

Conditions	Yield
In water introduction of pure HN3 in a soln. of Rb2CO3 in a Pt-vessel; evapn.;; drying at 80°C; specially pure;;
In water introduction of pure HN3 in a soln. of Rb2CO3 in a Pt-vessel; evapn.;; drying at 80°C; specially pure;;
In water aq. HN3 was reacted with Rb2CO3;

rubidium carbonate + ammonia (7664-41-7) → rubidium azide (22756-36-1)

Conditions	Yield
In ammonia aq. NH3;

hydrogen azide + rubidium hydroxide → rubidium azide (22756-36-1)

Conditions	Yield
In water react. of RbOH and HN3 in weakly acidic soln.; evapn.;;
In water react. of RbOH and HN3 in weakly acidic soln.; evapn.;;
In diethyl ether react. of hydroxide with HN3 dissolved in Et2O; recrystn. from small amt. of H2O at 80°C;

rubidium carbonate + sodium azide + sulfuric acid (7664-93-9) → rubidium azide (22756-36-1)

Conditions	Yield
In water byproducts: CO2; to aq. NaN3 soln. aq. H2SO4 added; liberated HN3 distd. into aq. RbCO3 soln.; evapn.; recrystn. from EtOH; vac. dried at 150°C;

rubidium azide (22756-36-1) → rubidium

Conditions	Yield
In neat (no solvent) thermal decompn., quartz tube, vac. app.; preheating for 12 h to 200°C, heating to 395°C (decompn. temp.), 0.1 mmHg (max.), several days;; distn.; blue-green residue contains silicate, undecomposed azide, and about 80% nitride;;	60%
In neat (no solvent) byproducts: N2; heating of RbN3 in a vessel of quartz at 395°C and high vac.; sometimes the decompn. take place only after hours;;
In neat (no solvent) byproducts: N2, Rb3N; decompn. of RbN3; distn. of Rb;; the residue contains essentially Rb3N;;

rubidium azide (22756-36-1) → nitrogen (7727-37-9)

Conditions	Yield
tendency to explode of explosion; decompn. start at 260°C; continuous evolution of N2 at 310°C; product pure;

rubidium azide (22756-36-1) → rubidium nitride + rubidium

Conditions	Yield
In neat (no solvent) decompn. of RbN3;; separation of Rb by sublimation;;
In neat (no solvent) decompn. of RbN3;; separation of Rb by sublimation;;

manganese(III) oxide + rubidium nitrate (13126-12-0) + rubidium azide (22756-36-1) → Rb(1+)*MnO2(1-)=RbMnO2

Conditions	Yield
In neat (no solvent) byproducts: N2; RbN3:RbNO3:Mn2O3 molar ratio was 5:1:3, grinding, pressing (1E5 N), drying (1E-3 mbar, 130 °C, 12 h), heating under Ar flow: 25/260 °C (100 k/h), 260/380 °C (5 k/h), 380/600 °C (20 K/h), annealing at 600 °C for 30 h;

carbon disulfide (75-15-0) + rubidium azide (22756-36-1) → rubidium azidothiocarbonate

Conditions	Yield
In water react. of CS2 and RbN3 in H2O; addn. of ethanol at <0°C;; crystn. from soln.;;
In water

rubidium azide (22756-36-1) + copper(II) azide → rubidium copper (II) azide

Conditions	Yield
In water dissolving freshly prepared, moisted Cu(N3)2 in hot, concd. RbN3 soln.; cooling;; pptn.; washing with cold water and methanol; drying at ambient temp.;;
In ethanol on dissolving Cu(N3)2 in the concd. soln. of the azide;;
In water dissolving freshly prepared, moisted Cu(N3)2 in hot, concd. RbN3 soln.; cooling;; pptn.; washing with cold water and methanol; drying at ambient temp.;;

rubidium azide (22756-36-1) + rubidium iodide → 2Rb(1+)*I(1-)*N3(1-)=Rb2IN3

Conditions	Yield
In water crystn. from concd. aq. equimolar soln. in desiccator under Ar over CaCl2 within 4 wk;; drying over P2O5 in oil pump vac.; product is not free from educts (X-ray);;
In melt react. in melt at 320-340°C (<15 min);; partial decompn. of azide (X-ray);;

[60]fullerene + rubidium azide (22756-36-1) → 3Rb(1+)*C60(3-) = Rb3C60

Conditions	Yield
In neat (no solvent) heated to 300°C for 30 min, then at 500°C at 0.5 mTorr;;

rubidium azide (22756-36-1) + fullerene-C60 (99685-96-8, 161105-99-3, 161106-00-9, 111138-12-6, 133318-63-5, 134053-11-5, 134931-35-4, 134931-36-5, 139703-76-7, 145633-27-8, 175414-73-0, 175414-74-1, 175414-75-2, 175519-12-7, 175519-13-8, 175519-14-9, 175519-15-0, 136376-46-0, 144906-37-6, 144906-38-7, 151767-00-9, 152882-97-8, 152882-98-9, 152882-99-0, 153062-34-1, 154171-74-1, 154171-75-2, 154333-99-0, 154334-00-6, 154397-63-4, 154460-59-0, 199456-56-9, 108739-25-9, 120329-57-9, 120329-58-0) → trirubidium fulleride

Conditions	Yield
In neat (no solvent) heating stoichiometric amts. of C60 and alkali metal azide to its decompn. temp. under dynamic vac.; cooling to room temp.;
In not given soln. mixed and evapn., thermal decompn. of RbN3;

cesium azide (22750-57-8) + rubidium azide (22756-36-1) + fullerene-C60 (99685-96-8, 161105-99-3, 161106-00-9, 111138-12-6, 133318-63-5, 134053-11-5, 134931-35-4, 134931-36-5, 139703-76-7, 145633-27-8, 175414-73-0, 175414-74-1, 175414-75-2, 175519-12-7, 175519-13-8, 175519-14-9, 175519-15-0, 136376-46-0, 144906-37-6, 144906-38-7, 151767-00-9, 152882-97-8, 152882-98-9, 152882-99-0, 153062-34-1, 154171-74-1, 154171-75-2, 154333-99-0, 154334-00-6, 154397-63-4, 154460-59-0, 199456-56-9, 108739-25-9, 120329-57-9, 120329-58-0) → 0.5Rb(1+)*2.5Cs(1+)*C60(3-)=Rb0.5Cs2.5C60

Conditions	Yield
In neat (no solvent) heating stoichiometric amts. of C60 and alkali metal azides to their decompn. temp. under dynamic vac.; cooling to room temp.;

cesium azide (22750-57-8) + rubidium azide (22756-36-1) + fullerene-C60 (99685-96-8, 161105-99-3, 161106-00-9, 111138-12-6, 133318-63-5, 134053-11-5, 134931-35-4, 134931-36-5, 139703-76-7, 145633-27-8, 175414-73-0, 175414-74-1, 175414-75-2, 175519-12-7, 175519-13-8, 175519-14-9, 175519-15-0, 136376-46-0, 144906-37-6, 144906-38-7, 151767-00-9, 152882-97-8, 152882-98-9, 152882-99-0, 153062-34-1, 154171-74-1, 154171-75-2, 154333-99-0, 154334-00-6, 154397-63-4, 154460-59-0, 199456-56-9, 108739-25-9, 120329-57-9, 120329-58-0) → 1.5Cs(1+)*1.5Rb(1+)*C60(3-)=Cs1.5Rb1.5C60

Conditions	Yield
In neat (no solvent) heating stoichiometric amts. of C60 and alkali metal azides to their decompn. temp. under dynamic vac.; cooling to room temp.;

cesium azide (22750-57-8) + rubidium azide (22756-36-1) + fullerene-C60 (99685-96-8, 161105-99-3, 161106-00-9, 111138-12-6, 133318-63-5, 134053-11-5, 134931-35-4, 134931-36-5, 139703-76-7, 145633-27-8, 175414-73-0, 175414-74-1, 175414-75-2, 175519-12-7, 175519-13-8, 175519-14-9, 175519-15-0, 136376-46-0, 144906-37-6, 144906-38-7, 151767-00-9, 152882-97-8, 152882-98-9, 152882-99-0, 153062-34-1, 154171-74-1, 154171-75-2, 154333-99-0, 154334-00-6, 154397-63-4, 154460-59-0, 199456-56-9, 108739-25-9, 120329-57-9, 120329-58-0) → 0.5Cs(1+)*2.5Rb(1+)*C60(3-)=Cs0.5Rb2.5C60

Conditions	Yield
In neat (no solvent) heating stoichiometric amts. of C60 and alkali metal azides to their decompn. temp. under dynamic vac.; cooling to room temp.;

cesium azide (22750-57-8) + rubidium azide (22756-36-1) + fullerene-C60 (99685-96-8, 161105-99-3, 161106-00-9, 111138-12-6, 133318-63-5, 134053-11-5, 134931-35-4, 134931-36-5, 139703-76-7, 145633-27-8, 175414-73-0, 175414-74-1, 175414-75-2, 175519-12-7, 175519-13-8, 175519-14-9, 175519-15-0, 136376-46-0, 144906-37-6, 144906-38-7, 151767-00-9, 152882-97-8, 152882-98-9, 152882-99-0, 153062-34-1, 154171-74-1, 154171-75-2, 154333-99-0, 154334-00-6, 154397-63-4, 154460-59-0, 199456-56-9, 108739-25-9, 120329-57-9, 120329-58-0) → 2Rb(1+)*Cs(1+)*C60(3-) = Rb2CsC60

Conditions	Yield
In neat (no solvent) heating stoichiometric amts. of C60 and alkali metal azides to their decompn. temp. under dynamic vac.; cooling to room temp.;

cesium azide (22750-57-8) + rubidium azide (22756-36-1) + fullerene-C60 (99685-96-8, 161105-99-3, 161106-00-9, 111138-12-6, 133318-63-5, 134053-11-5, 134931-35-4, 134931-36-5, 139703-76-7, 145633-27-8, 175414-73-0, 175414-74-1, 175414-75-2, 175519-12-7, 175519-13-8, 175519-14-9, 175519-15-0, 136376-46-0, 144906-37-6, 144906-38-7, 151767-00-9, 152882-97-8, 152882-98-9, 152882-99-0, 153062-34-1, 154171-74-1, 154171-75-2, 154333-99-0, 154334-00-6, 154397-63-4, 154460-59-0, 199456-56-9, 108739-25-9, 120329-57-9, 120329-58-0) → Rb(1+)*2Cs(1+)*C60(3-) = RbCs2C60

Conditions	Yield
In neat (no solvent) heating stoichiometric amts. of C60 and alkali metal azides to their decompn. temp. under dynamic vac.; cooling to room temp.;

Upstream product

• 7727-37-9 nitrogen 
• 132486-03-4 rubidium chloride 
• 18810-58-7 barium azide 
• 7782-79-8 hydrogen azide 
• 7664-41-7 ammonia 
• 7664-93-9 sulfuric acid 

Relevant articles and documents

RbBa2(N3)5: A new ternary azide

Rubidium dibarium pentaazide, RbBa2(N3)5, was prepared from an aqueous solution of the binary azides at room temperature. It crystallizes in the monoclinic system (space group P2/n). Two central atoms of azide groups occupy the 2c (1) and 2b (1) positions, another azide group lies completely on a twofold axis (2f), while Rb atoms are situated in 2e (2) positions. The crystal structure of RbBa2(N 3)5 can be regarded as a distorted AlB7-type arrangement of the metal atoms, with the azide groups occupying the voids between the cations. This results in coordination numbers of 8 (Rb) and 10 (Ba). The N-N distances are in the range 1.169 (8)-1.190 (5) A, typical for the azide group.

A new polyoxocobaltate(II) anion in Rb2Co2O3

Rb2Co2O3 was prepared via the azide/nitrate route. Mixtures of the precursors Co3O4, RbN3 and RbNO3 in the molar ratios 6:17:1 were heated in a special regime up to 450°C and annealed at this temperature for 50 h in silver crucibles. Single crystals have been grown by subsequent annealing of prepared powder at 450°C for 500 h in silver crucibles, which were sealed in glass ampoules under dried Ar. According to the X-ray analysis of the crystal structure (Pnma, Z = 8, 11.729(2), 6.058 (1), 8.004(1) A) cobalt is trigonal planar coordinated by oxygen atoms. The CoO3-units share through all corners and build up an infinite two-dimensional ∞2Co2O3-network.

Synthesis and Structural Characterization of the layered Selenogallate RbGaSe2

The chalcogenogallate RbGaSe2 was synthesized by thermal decomposition of rubidium azide in the presence of gallium selenide and selenium. RbGaSe2 crystallizes in the monoclinic space group C2/c (no. 15) with the lattice parameters a = 10.954(1) ?, b = 10.949(1) ?, c = 16.064(1) ?, β = 99.841(4)°, V = 1898.2(2) ?3, and Z = 16 (single-crystal data, 20 °C) in the TlGaSe2 structure type. Its crystal structure features anionic layers 2∞[Ga4Se84–] with a van der Waals distance of 3.30(1) ?. Thermal analysis revealed a melting point of about 930 °C. Using UV/Vis diffuse reflectance spectroscopy, a wide bandgap of 3.16 eV was determined for the colorless semiconductor. The bonding situation in the compound was further compared with the isotypic cesium phases based on the results from Raman spectroscopy and DFT calculations. The slight shifts of the Raman bands suggest a slightly higher covalency of the rubidium compound.

Alkali metal nitrido tecto metallates(VI) with networks of six-membered rings of corner-sharing tetrahedra [(MNN3/2)6] with M = Mo, W of the unexpected composition A9+x[M6N15] with A = Rb, Cs and 0 < x < 1

Reactions of metal powders of Mo and W respectively with amides and azides of Rb and Cs lead to the compounds Rb9+x[W6N15] and Cs9+x[M6N15] with M = Mo, W and 0 a matrix of the corresponding alkali metal. These metals result from the thermal decomposition of the amides and azides used in high molar ratios. The metals are washed out by liquid ammonia. Besides microcrystalline material of the above mentioned compounds single crystals suitable in size for x-ray structure determinations were isolated. The compounds crystallize in the space group R3c (No. 167) with Z = 6 and the following lattice constants: Rb9+x[W6N15]: a = 12.743(7) A, c = 27.794(8) A, c/a = 2.181 Cs9+x[Mo6N15]: a = 13.104(5) A, c = 28.430(9) A, c/a = 2.170 Cs9+x[W6N15]: a = 13.136(5) A, c = 28.472(6) A, c/a = 2.167 The metal centres of tetrahedra [MNN3/2] are condensated to cyclohexane analogue six-membered rings in chair-form via nitrogen atoms and axial ones connect them to a three-dimensional network. Nine - as to the formula unit - of the alkali metal atoms are located in vacancies of the anionic partial structure. The residual atoms with 0 x 1 centre the six-membered rings and are coordinated planar hexagonal by N neighbours.

Synthesis and crystal structure of Rb3AgO2

Rb3AgO2 was prepared via the azide/nitrate route. Stoichiometric mixtures of the precursors (Ag2O, RbN3 and RbNO3) were heated in a special regime up to 450°C and annealed at this temperature for 50 h in silver crucibles. Single crystals have been grown by subsequent annealing of the as prepared powder at 450°C for 500 h in silver crucibles, which were sealed in glass ampoules under dried Ar. According to the X-ray analysis of the crystal structure (P212121, Z = 16, a = 12.800(1), b = 12.848(1), c = 14.329(1) A, 6566 independent reflections, R(all) = 0.0795, Rw(all) = 0.0218), Rb3AgO2 is isostructural with K3AgO2. The structure can be derived from the fluorite structure type. Silver is linearly coordinated by oxygen atoms, while Rb has pseudo-tetrahedral coordination. The crystal under investigation was composed of four twin individuals.

K5Mn3O6and Rb8Mn5O10, new charge ordered quasi one-dimensional oxomanganates (II, III)

K5Mn3O6 and Rb8Mn5O10 have been synthesized via the azide/nitrate route from stoichiometric mixtures of MnO and KNO3/ KN3, or RbNO3/RbN3, respectively. The two new members of manganese (II/III) mixed-valent oxides have been studied by single-crystal X-ray diffraction, magnetic susceptibility measurements and density functional theory calculations (DFT). Both crystal structures [K5Mn3O6: Pna21, Z = 4, a = 1632.43(7), b = 970.07(4), c = 616.48(3) pm, R1 = 0.051; Rb8Mn5O10: P21/c, Z = 8, a = 1223(2), b = 2717(3), c = 1220(2) pm, β = 118.25(2)° , R1 = 0.086] display quasi one-dimensional [MnO2]n-- chains, composed of edge sharing MnO4 tetrahedra. Complete charge ordering of Mn2+ and Mn3+ is observed along the chain direction with repetition units [-Mn3+-Mn2+-Mn,2+-] resulting for K5Mn3O6, and [-Mn3+-Mn2+-Mn2+-Mn3+-Mn2+-] for Rb8Mn5O10. Magnetic susceptibility data as well as DFT calculations indicate strong anti-ferromagnetic intra-chain coupling to be present already at ambient temperature, and above. Rb8Mn5O10 features threedimensional spin ordering below TN = 10.9 K, mediated by ferromagnetic coupling between the chains, while such a 3D coupling appears to be frustrated in K5Mn3O6.

Synthesis, crystal structures, and vibrational spectra of novel azidopalladates of the alkali metals Cs2[Pd(N3) 4] and Rb2[Pd(N3)4]·2/3H 2O

The transparent dark orange compounds Cs2[Pd(N3) 4] and Rb2[Pd(N3)4]·2/3H 2O are synthesized by reaction, of the respective binary alkali metal azides with K2PdCl4 in aqueous solutions. According to single-crystal X-ray diffraction investigations, the novel ternary azidopalladates(II) crystallize in the monoclinic space group P21/c (no. 14) with a = 705.7(2) pm, b = 717.3(2) pm, c = 1125.2(5) pm, β= 104.58(2)°, mP30 for Cs2[Pd(N3)4] and a = 1041.4(1) pm, b = 1292.9(2) pm, c = 1198.7(1) pm, β= 91.93(1)°, mP102 for Rb2[Pd(N3)4].2/3H2O, respectively. Predominant structural features of both compounds are discrete [PdII(N3)4]2- anions with palladium in a planar coordination by nitrogen, but differing in point group symmetries. The vibrational spectra of the compounds are analyzed based on the idealized, point group C4h, of the spectroscopically relevant unit, [Pd(N 3]2- taking into account the site symmetry splitting due to the symmetry reduction in the solid phase.

The chain manganates K29Mn17O34, Rb 11Mn8O16, and Cs4Mn 3O6: a new family of mixed-valent one-dimensional transition metallates

Air and moisture sensitive K29Mn17O34, Rb11Mn8O16 and Cs4Mn 3O6 were prepared via the azide/nitrate route from stoichiometric mixtures of the precursors Mn2O3, AN 3 and ANO3 (A = K, Rb, Cs) in special containers provided with silver inlays. Their compositions can be generalized as A xMnO2 with x varying between 1.703 and 1.333. According to the X-ray analysis of the crystal structures [K29Mn 17O34: lma2, Z = 4, a = 93.149(3), b = 10.0063(3), c = 6.0621(2) A, 6585 independent reflections, R1 = 0.053, wR(all) = 0.143; Rb11Mn8O16: F222, Z = 16, a = 12.2096(4), b = 20.1595(7), c = 43.712(2) A, 11534 independent reflections, R1 = 0.042, wR(all) = 0.131; Cs4Mn3O6: C222, Z = 8, a = 12.790(3), b = 21.123(4), c =8.179(2) A, 2212 independent reflections, R1 = 0.051, wR(fall) = 0.122], the main feature of all three crystal structures are 1∞MnO2n- chains built up from partially distorted edge-sharing MnO4 tetrahedra. The alkali metal ions fill the space between the anionic entities forming honeycomb like arrangements. In all cases manganese is in a mixedvalent state but no full charge ordering is noticeable. The variations of the charges along the MnO 2n- chains seem to be best described in terms of charge density waves. The magnetic susceptibilities show the dominance of strong antiferromagnetic interactions for the rubidium and the cesium compounds, whereas ferro- or ferrimagnetic interactions prevail in the potassium compound.

The AFeO2 (A=K, Rb and Cs) family: A comparative study of structures and structural phase transitions

Structures and phase transitions for the isostructural series of compounds KFeO2, RbFeO2 and CsFeO2 have been systematically studied by synchrotron X-ray high resolution powder diffraction experiments and in case of CsFeO2 also by single crystal diffractometry. At room temperature, all of the three compounds crystallize in the orthorhombic (Pbca) KGaO2 type of structure consisting of a three dimensional network of corner-sharing [FeO4/2]- tetrahedra, which at elevated temperatures shows a reversible phase transformation to a cubic structure (space group Fd over(3, -) m). For KFeO2, RbFeO2 and CsFeO2 this phase transformation takes place at 1003 K, 737 K and 350 K respectively, as confirmed by differential scanning calorimetry and X-ray diffraction. Upon heating through the transitions the major structural changes are driven by the onset or enhancement of librational motion of the FeO4 tetrahedra. Due to this phenomenon the Fe-O-Fe bonds appear to step-wise getting straight, seemingly approaching 180° within the time and space averaged structure.

RbGa3S5 und CsGa3S5 - Zwei neue strukturtypen

The title compounds RbGa3S5 and CsGa 3S5 were synthesized by a solid state reaction starting from GaS, S and MN3 (M = Rb, Cs) as alkaline metal source. They crystallize in the space group P21/su