Structural diversity and magnetic properties of thiocyanate copper(II) complexes

Seven novel compounds [Cu(pz)(2)(ScN)(2)](n) (1), [Cu(ind)(2)(SCN)(2)](n)center dot H2O (2), [Cu(4-apy)(SCN)(2)](n) (3), [Cu(4-cpy)(SCN)2](n) (4), [Cu-2(mu-SCN)(2)(SCN)(2)(2-aepy)(2)](n) (5), [Cu(2-ambzim)(SCN)(2)](n) (6) and [Cu-2(mu-SCN)(2) (SCN)(2)(pybzim)(2)] (7) have been synthesized and characterised structurally (by single X-Ray analysis) and spectroscopically. Variable-temperature magnetic susceptibility measurements were performed for the compounds 1, 3, 5, 6 and 7 and their magneto-structural properties were discussed. In structure 1, the weak Cu-S coordination bonds expand molecules [Cu(pz)(2)(SCN)(2)] to the layer extending along crystallographic (100) plane. In 2, 3 and 4, neutral trans-[Cu(ind)(2)(SCN)(2)], trans-[Cu(4-apy)(2)(SCN)(2)] and cis-[Cu(ambzim)(SCN)(2)] molecules are linked by end-to-end thiocyanate groups to an infinite one-dimensional chains. The structures 5 and 7 include neutral dinuclear entities. Copper(II) centers of 5 are doubly bridged by linear thiocyanate anions in end-on fashion, whereas the central ions of 7 are linked by SCNions in end-to-end coordination mode. The dinuclear [Cu-2(mu(1.1)-SCN)(2)(SCN)(2)(2-aePY)(2)] units are further linked by mu(1.3)-double end-to-end thiocyanate groups. Simultaneous existence of both EE and EO bridging modes makes the complex 5 a rare example of thiocyanate-bridged copper(II) structures. (C) 2012 Elsevier Ltd. All rights reserved.