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An Imidazolate‐ and Azide‐Bridged Copper(II) Coordination Polymer Consisting of Alternating Di‐ and Mononuclear Units
Author(s) -
Sakai Kenichi,
Akutagawa Tomoyuki,
Nakamura Takayoshi
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201000835
Subject(s) - chemistry , azide , imidazolate , crystallography , imidazole , copper , square pyramidal molecular geometry , coordination polymer , ferrimagnetism , antiferromagnetism , magnetic susceptibility , supramolecular chemistry , stereochemistry , ferromagnetism , crystal structure , inorganic chemistry , organic chemistry , condensed matter physics , magnetization , magnetic field , physics , quantum mechanics
Using the Cu II ‐imidazole(Him) complex [Cu(Him) 4 Cl]Cl as the starting material, the imidazolate (im)‐ and azide‐bridged Cu II coordination polymer [Cu 3 (Him) 4 (im) 2 (N 3 ) 4 ] n was successfully obtained. Single‐crystal X‐ray analysis revealed that it possesses an im‐bridged linear‐chain structure consisting of alternating dinuclear units with a symmetric end‐on azide‐bridged [Cu(μ 1,1 ‐N 3 ) 2 Cu] 2+ core and mononuclear units. All of the Cu ions adopt a square pyramidal geometry with an azide at the Jahn–Teller elongated apical position. Some of the azides act as end‐to‐end interchain bridging ligands from the mononuclear unit to the nearest neighbouring dinuclear unit of the adjacent chain forming a two‐dimensional network. Temperature‐variable magnetic susceptibility measurements showed that it exhibits one‐dimensional ferrimagnetic‐like behaviour, which can be ascribed to two types of exchange couplings with opposite signs, namely a weak ferromagnetic coupling through the end‐on azide bridges within the dinuclear units and a stronger antiferromagnetic coupling through the im bridges between the di‐ and the mononuclear units.