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Synthesis, Structural and Dielectric Characterization of two Imidazole‐ and Oxalate‐containing Copper(II) Complexes
Author(s) -
Zhu RunQiang,
Zhang Wen
Publication year - 2013
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201300101
Subject(s) - chemistry , oxalate , stoichiometry , reagent , hydrogen bond , supramolecular chemistry , imidazole , aqueous solution , crystallography , copper , inorganic chemistry , molecule , crystal structure , stereochemistry , organic chemistry
Reaction of Cu(ox)(H 2 O) 0.5 (ox = oxalate dianion) with HIm (HIm = imidazole) in aqueous solution yields two Cu II complexes, [Cu 3 (H 2 O) 4 (HIm) 4 (μ‐Im) 2 (ox) 2 ] ( 1 ) (Im = imidazole anion) and [Cu(HIm) 6 ](ox) ( 2 ). Formation of the two compounds depends on the molar ratio of the reactants and a secondary reagent, indicating a rich chemistry of the combination of Cu II /ox/HIm components. Structural analyses of the two compounds show that 1 is a linear trinuclear cluster, in which the two Im anions act as bridging ligands and 2 shows a rare 6:1 HIm/Cu stoichiometry with a CsCl‐type packing structure. There are numerous N–H ··· O and O–H ··· O hydrogen bonds among the ox, HIm, and/or H 2 O components, leading to complicate supramolecular hydrogen‐bond networks. Temperature‐dependent dielectric constants of the compounds show no dielectric anomalies between 100–345 K, suggesting no structural phase transitions in the measured temperature range.