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Assembly of Dinuclear Cu II Rigid Blocks by Bridging Azido or Poly(thiocyanato)chromates: Synthesis, Structures and Magnetic Properties of Coordination Polymers and Polynuclear Complexes
Author(s) -
Kolotilov Sergey V.,
Cador Olivier,
Gavrilenko Konstantin S.,
Golhen Stéphane,
Ouahab Lahcène,
Pavlishchuk Vitaly V.
Publication year - 2010
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.200900819
Subject(s) - chemistry , crystallography , cationic polymerization , dimer , copper , magnetism , stereochemistry , polymer , coordination polymer , antiferromagnetism , polymer chemistry , crystal structure , physics , organic chemistry , quantum mechanics , condensed matter physics
Reaction of a dinuclear cationic copper(II) complex of 4,4′‐[2‐(3‐hydroxyiminobutyl)imino]biphenyl [Cu II 2 (LH) 2 ] 2+ with N 3 – resulted in the formation of a dinuclear azido [Cu II 2 (LH) 2 (N 3 ) 2 (H 2 O) 2 ] complex or a 2D coordination polymer [Cu II 2 (LH) 2 (N 3 ) 2 ] n . Reaction of the dinuclear complex with [Cr III (NCS) 6 ] 3– or [Cr III (NCS) 4 (NH 3 ) 2 ] – produced a 2D polymer {[Cu II 2 (LH) 2 (CH 3 CN) 2 ] 3 [Cr III (NCS) 6 ] 2 } n or a 1D chain, constructed from tetranuclear units {[Cu II 2 (LH) 2 ][Cr III (NCS) 4 (NH 3 ) 2 ] 2 } n . Structures of the compounds were determined by X‐ray crystallography and complexes were characterised by the temperature dependency of the magnetic susceptibility and by ESR spectroscopy. Magnetic properties of homometallic compounds were fit with the model of a dimer with the Hamiltonian Ĥ = – JŜ 1 · Ŝ 2 . For heterometallic complexes χ M T curves were fit as the superposition of magnetism resulting from both [Cu II 2 (LH) 2 ] 2+ and the adjacent Cr III ‐containing anion. J values for the complexes lie in the range from –12.74(4) to –17.77(8) cm –1 . It was shown that the 4,4′‐biphenyl bridge efficiently mediates exchange interactions.