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457 results on '"Rzaigui, M."'

53. Preparation and Characterization of bis (4-methoxyanilinium) tetrachlorozincate

Author

Rahmouni, H., Sta, W. Smirani, Rzaigui, M., Rahmouni, H., Sta, W. Smirani, and Rzaigui, M.

Abstract

A new zinc complex of formula [C7H10NO]2 ZnCl4 has been prepared and characterized by X-ray diffraction, IR and UV-Visible spectroscopies. The complex crystallizes in the monoclinic space group P21/n with a minimal tetrahedral distortion of the ZnCl42- ion and with lattice parameters: a =12.054 (2) Å, b =7.129 (3) Å, c =23.480 (2) Å, β = 100.67 (2)°, V = 1983.03 (1) Å3 and Z = 4. The crystal structure was solved and refined to R = 0.080 and RW = 0.227 with 9611 independent reflections. It can be described by organic layers of p-anisidinium cations held together by C-H…O hydrogen bonds parallel to (010) plane, linked to the inorganic groups of ZnCl42- anions through N-H…Cl hydrogen bonds, electrostatic and Van Der Waals interactions, to form a three-dimensional network.

Published
2014

58. Synthesis, Crystal Structure, and Characterization of the first Organic Cation Hexaoxoperiodate

Author

Wacharine, I., Smirani, Wajda Sta, Rzaigui, M., Wacharine, I., Smirani, Wajda Sta, and Rzaigui, M.

Abstract

The title compound is an organic-inorganic hybrid material. The single crystal X-ray diffraction investigation reveals that the studied compound crystallizes in the monoclinic system, space group P21/c with the following lattice parameters:               𝑎 = 7.551 (2) Ã…, 𝑏 = 6.694 (3) Ã…, 𝑐 = 14.783 (2) Ã…, β = 97.61 (2)° and 𝑍 = 2. The crystal lattice is composed of a discrete (H4IO6)− anion surrounded by piperazinium cations and water molecules. Complex hydrogen bonding interactions between the different chemical spices form a three-dimensional network. Room temperature IR, 13C NMR spectroscopy, thermogravimetric analysis and optical absorption of the title compound were recorded and analyzed.Â

Published
2013

59. Synthesis and Physico-Chemical Characterization of a New Non-Centrosymmetric Organic Cation Iodate

Author

Dhiab, A.C., Sta, W. Smirani, Rzaigui, M., Dhiab, A.C., Sta, W. Smirani, and Rzaigui, M.

Abstract

The synthesis, crystal structure and physico-chemical characterization are presented for the piperazinium bis iodate dihydrate. An X-ray investigation has shown that this compound crystallizes in a non-centrosymmetric monoclinic system, space group Pc with the lattice parameters: a = 8.969 (2) Å, b = 6.027 (3) Å, c = 11.958 (2) Å; V = 612.7 (3) Å3 and Z = 2. The structure was solved from 3546 independent reflexions with R1 = 0.053 and wR2 = 0.130. I…O halogen bonds [R22(4) graph-set motif] range between 2.770 (4) and 3.108 (1) Å and connect neighboring IO-3 anions with each other so as to create a bi-dimensional layer parallel to the (b,c) plane. These layers are interconnected via N−H…O and C−H…O, to the piperazinium dication to generate a three-dimensional network.

Published
2011

93. Synthesis and Physico-Chemical Studies of a New Noncentrosymmetric Bis[ N-(2-hydroxyethyl)piperazine-1,4-diium] Tetraki s(hydrogen oxalate) Trihydrate: [CHNO](HCO)·3HO.

Author

Essid, M., Rzaigui, M., and Marouani, H.

Subjects
OXALATES, SINGLE crystals, CRYSTAL structure, MOLECULAR structure, HYDROGEN bonding, NUCLEAR magnetic resonance spectroscopy, ULTRAVIOLET-visible spectroscopy
Abstract

The new noncentrosymmetric oxalate with the general formula [CHNO](HCO)·3HO, has been synthesized and single crystals were grown from aqueous solution by slow evaporation technique. Single crystal X-ray diffraction study on grown crystal reveals that they belong to triclinic system with space group P1. The unit cell dimensions are: a = 5.688(2) Å, b = 8.315(2) Å, c = 16.634(3) Å, α = 96.63(2)°, β = 99.81(3)°, γ = 110.01(2)° with V = 715.4(3) Å and Z = 1. The structure has been solved using a direct method and refined to a reliability R factor of 0.052. The structure is built up from anionic chains parallel to the a-axis. These chains are interconnected by the organic cations and water molecules via hydrogen bonds so as to build a three dimensional arrangement. FT-IR spectrum confirms the presence of the functional groups in the synthesized material. The C CP-MAS NMR spectrum is in agreement with the X-ray structure. UV-Vis spectrum indicates that the crystal is transparent in UV and visible region with a lower cutoff wavelength of 212 nm. The DSC curve indicates that the crystal is thermally stable up to 330 K. Graphical Abstract: The molecular structure of bis( N-(2-hydroxyethyl)piperazine-1,4-diium) Tetraki s(hydrogen oxalate) Trihydrate is formed by N-(2-hydroxyethyl)piperazine-1,4-diium cations, oxalate anions and water molecules held together by means of N-H⋯O, C-H⋯O, O-H⋯OW and OW-H⋯OW(O) hydrogen bonds to form three-dimensional network.[Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

Published
2015
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