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

作者：Kolotilov Sergey V; Cador Olivier; Gavrilenko Konstantin S; Golhen Stephane; Ouahab Lahcene^*; Pavlishchuk Vitaly V

来源：European Journal of Inorganic Chemistry, 2010, (8): 1255-1266.

DOI：10.1002/ejic.200900819

• Exchange interactions
• Copper
• Chromium
• Coordination polymers
• N,O ligands

Reaction of a dinuclear cationic copper(II) complex of 4,4'-[2(3-hydroxyiminobutyl)imino]biphenyl [Cu-2(II)(LH)(2)](2+) with N-3(-) resulted in the formation of a dinuclear azido [Cu-2(II)(LH)(2)(N-3)(2)-(H2O)(2)] complex or a 2D coordination polymer [Cu-2(II)(LH)(2)(-)(N-3)(2)](n). Reaction of the dinuclear complex with [Cr-2(II)(NCS)(6)](3-) or [Cr-III(NCS)(4)(NH3)(2)](-) produced a 2D polymer {[Cu-2(II)(LH)(2)(CH3CN)(2)](3)[Cr-III(NCS)(6)](2)}(n) or a 1D chain, constructed from tetranuclear units {[Cu-2(II)(LH)(2)][Cr-III(NCS)(4)- (NH3)(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 (H) over cap= J (S) over cap (1)center dot(S) over cap (2). For heterometallic complexes chi T-M curves were fit as the superposition of magnetism resulting from both [Cu-2(III)(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.

• 出版日期2010-3