Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/60463
Type: Artigo de periódico
Title: Intermolecular interactions between imidazole derivatives intercalated in layered solids. Substituent group effect
Author: Gonzalez, M
Lemus-Santana, AA
Rodriguez-Hernandez, J
Aguirre-Velez, CI
Knobel, M
Reguera, E
Abstract: 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.
Subject: Hybrid crystals
2D solids
Molecular magnets
Dipole-dipole interaction
pi-pi interaction
Country: EUA
Editor: Academic Press Inc Elsevier Science
Rights: fechado
Identifier DOI: 10.1016/j.jssc.2013.05.029
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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