Amor Jouini

Structure cristalline et etude par spectrometrie de vibration (IR et Raman) du bis(ethylenediammonium) diphosphate (NH3(CH2)2NH3)2 · P2O7

Abstract Classical methods extensively known for the synthesis of inorganic condensed phosphates are used to give compounds that are intermediate between inorganic and organic. We prepared the title compound to examine the possibility of using, in this new field, the ion exchange resin and Boulle´s methods. Chemical preparation, crystal structure, and vibrational studies are given for a new diphosphate. The bis(ethylenediammonium) diphosphate salt is monoclinic with the unit cell dimensions a = 8.724(1), b = 13.511(2), c = 10.039(1)A, β = 96.25(1)°, V = 1176.3(5)A 3 , D m = 1.673Mg m −3 , D x = 1.684Mg m −3 , μ = 2.163 mm −1 , space group C 2 c with Z = 4. The structure was solved by the Patterson method and refined to a final R value of 0.059 for 2602 observed independent reflections. The P O(L) P bridge is symmetrical with a P O(L) distance of 1.570(1)Aand a POP angle of 141.94(7)°. The P 2 O 4− 7 anions are located around the twofold axis. The ethylenediammonium dications have a trans configuration. Half of them, having a crystallographic inversion center, are located in channels delimited by the diphosphate anions. The others, located around the twofold axis, are sandwiched along the c axis between two diphosphate anions. The cohesion and the stability of the atomic arrangement result from the N H···O hydrogen bonds. The IR and Raman spectra of [NH 3 (CH) 2 NH 3 2 · P 2 O 7 are recorded and analyzed. From the spectra it is inferred that the P 2 O 4− 7 anion has a C 2 symmetry in the crystal; all the POP modes (stretching and bending) are active in IR and Raman.

Structure, thermal behavior, and IR investigation of bis(3-amino-1,2,4-triazolium)monohydrogen monophosphate

Chemical preparation, calorimetric studies, crystal structure, and IR spectrometric investigation of (C2H5N4)2HPO4, denoted ATZP, are described. The compound crystallizes in the monoclinic system with C2/c space group. Its unit cell dimensions are a = 13.589(2) Å b = 11.105(2) Å c = 15.734(3) Å β = 104.68(2)°, V = 2296.8(7) Å3, and Z = 8. The structure of the title compound consists of a three dimensional network of H-bonds connecting all its components. The IR spectrum of ATZP is reported and discussed on the basis of group theoretical analysis.

Etude calorimétrique et structure cristalline du putrescinium monohydrogénomonophosphate dihydrate NH3(CH2)4NH3HPO42H2O

Abstract Chemical preparation, calorimetric studies, and crystal structure are given for a new monophosphate. The putrescinium monohydrogen monophosphate dihydrate salt is monoclinic with the unit cell dimensions a = 6.541(1) A, b = 16.648(3) A, c = 9.175(1) A, β = 95.74(1)°, V = 994.1(5) A3, Dm = 1.498 Mgm−3, Dx = 1.484 Mgm−3, μ = 2.732 mm−1, space group P2 1 c with Z = 4. The structure was solved by the Patterson method and refined to a final value of 0.046 for 1732 observed independent reflections. The structure shows a layer arrangement perpendicular to the c axis: planes of the [HPO4]2− tetrahedra alternate with planes of the [(CH2)4(NH3)2]2+ dication. The zeolitic water molecules are located between these planes separated by a distance of 2.294 A. The monohydrogen phosphate group is roughly tetrahedral with the symmetry 3m. The PO distances in this group range from 1.495(2) to 1.592(2) A. The amino groups of putrescine are protonated. The putrescinium dication has an extensive all-trans configuration with a noncrystallographic inversion center. The cohesion and the stability of the atomic arrangement result from three kinds of hydrogen bonds, NH····O, POH····O(w), and O(W)H····O. The differential scanning calorimetric study shows that the dehydration of this salt occurs in two steps respectively at 105 and 121°C with a loss of one water molecule per step. The anhydrous salt undergoes four phase transitions respectively at temperatures of 133, 143, 159, and 165°C.

Crystal structure, thermal analysis, and IR spectrometric investigation of bis(tert-butylammonium) sulfate

Chemical preparation, X-ray single crystal, thermal analysis, and IR spectrometric investigation of (C4H12N)2SO4, denoted tBAS, are described. The compound crystallizes in the monoclinic system with C2/c space group. Its unit cell dimensions are a = 11.1585(5) Å, b = 6.2148(4) Å, c = 20.070(1) Å, β = 102.004(4)°, V = 1361.4(1) Å3, and Z = 4. The crystal structure of tBAS can be described as a typical thick layered organization built by all the components of the structure and centered by planes z = 1/4 and 3/4. Connection in these layers are established by N—H···O hydrogen bonds. Thermal analysis shows a reversible weak phase transition.

Crystal structure, thermal analysis, and IR spectrometric investigation of 1,2-diammonium-2-methyl propane sulfate monohydrate

Chemical preparation, X-ray single crystal, thermal analysis, and IR spectrometric investigation of C4H14N2SO4·H2O (denoted DAMPS) are described. DAMPS crystallizes in the orthorhombic system with P212121 space group, a = 9.2726(4) Å, b = 9.5227(2) Å, c = 10.3807(4) Å, V = 916.62(6) Å3, and Z = 4. The DAMPS structure is built up from inorganic chains parallel to the b axis and linked via Ow–H···O hydrogen bonds. These chains are interconnected by organic groups so as to build a three-dimensional arrangement.

Structure, thermal behavior, and IR investigation of a new organic sulfate

Abstract[1-(2-ammoniumethyl) piperazinium] sulfate denoted PIPS has a monoclinic unit cell. The parameters are: a = 6.6521(3), b = 7.8756(5), c = 19.197(1) Å, β = 94.43(1)° and the space group is P21/n. The preparation, thermal analysis, and IR spectrometric investigation are described. The PIPS structure exhibits a complex three-dimensional network of H-bonds connecting all its components.

Crystal structure and thermal analysis of 1,5-diammonium-2-methyl pentane sulfate monohydrate

AbstractChemical preparation, x-ray single crystal, and thermal analysis of C6H18N2SO4·H2O (denoted DMPS) are described. The compound crystallizes in the triclinic system with P

Structure du tétrahydrazinium cyclotétraphosphate: [NH2NH3]4P4O12

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