Artículos de revistas
Intermolecular interactions between imidazole derivatives intercalated in layered solids. Substituent group effect
Registro en:
Journal Of Solid State Chemistry. Academic Press Inc Elsevier Science, v. 204, n. 128, n. 135, 2013.
0022-4596
WOS:000322932600021
10.1016/j.jssc.2013.05.029
Autor
Gonzalez, M
Lemus-Santana, AA
Rodriguez-Hernandez, J
Aguirre-Velez, CI
Knobel, M
Reguera, E
Institución
Resumen
This study sheds light on the intermolecular interactions between imidazole derive molecules (2-methyl-imidazole, 2-ethyl-imidazole and benzimidazole) intercalated in T[Ni(CN)(4)] layers to form a solid of formula unit T(ImD)(2)[Ni(CN)(4)]. These hybrid inorganic-organic solids were prepared by soft chemical routes and their crystal structures solved and refined from X-ray powder diffraction data. The involved imidazole derivative molecules were found coordinated through the pyridinic N atom to the axial positions for the metal T in the T[Ni(CN)(4)] layer. In the interlayers region ligand molecules from neighboring layers remain stacked in a face-to-face configuration through dipole-dipole and quadrupole-quadrupole interactions. These intermolecular interactions show a pronounced dependence on the substituent group and are responsible for an ImD-pillaring concatenation of adjacent layers. This is supported by the structural information and the recorded magnetic data in the 2-300 K temperature range. The samples containing Co and Ni are characterized by presence of spin-orbit coupling and pronounced temperature dependence for the effective magnetic moment except for 2-ethyl-imidazole related to the local distortion for the metal coordination environment. For this last one ligand a weak ferromagnetic ordering ascribed to a super-exchange interaction between T metals from neighboring layers through the ligands pi-pi interaction was detected. (C) 2013 Elsevier Inc. All rights reserved. 204 128 135 CONACyT [2009-01-129048, 2010-01-155413, 2011-01-166387, 2011-01-174247, 2012- 193850] FOINS [I0-296-2012] CONACyT [2009-01-129048, 2010-01-155413, 2011-01-166387, 2011-01-174247, 2012- 193850] FOINS [I0-296-2012]