Syntheses, Crystal Structures And Properties Of Two New Ion-Pair Complexes By Self-Assembly Of Bis(Maleonitriledithiolate)Copper(Ii)/Nickel(Iii) Anion And Substituted 4-Dimetylaminopyridinium
Synthetic Metals(2012)
Abstract
Two new ion-pair complexes, [ClBrBzPyN(CH3)(2)](2)[Cu(mnt)(2)](1) and [ClBrBzPyN(CH3)(2)][Ni(mnt)(2)](2) have been obtained by self-assembly of the [M(mnt)(2)](x-) (M=Cu(II) or Ni(III). mnt(2-) = maleonitriledithiolate, x=1 or 2) anion and [ClBrBzPyN(CH3)(2)](+) ([ClBrBzPyN(CH3)(2)](+) = [1-(4'-chloro-2'-bromobenzyl)-4-dimethylaminopyridiniuml) cation. The cations in 1 stack into a column through the C-H center dot center dot center dot Br hydrogen bonds and the pi center dot center dot center dot pi stacking interactions, while the [Cu(mnt)(2)](2-) (A) and the cations (C) stack alternately into a 1D column (i.e., of type ... CCACCACC ...). The anions and the cations in 2 stack into segregated columns in which the Ni(III) ions form a uniform I D zigzag magnetic chain. Magnetic susceptibility measurements in the temperature range 2-300 K show that 1 exhibits an antiferromagnetic coupling feature with theta = -25.3 K, while 2 shows characteristic of spin-gap (Delta/k(b) =1044.3 K) around 114 K. (C) 2012 Elsevier B.V. All rights reserved.
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Key words
Maleonitriledithiolate,Copper,Nickel,Substituted 4-dimethyl-aminopyridinium,Crystal structure,Magnetic properties
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