Antiferromagnetic coupling through cyano-bridge and H-bonds in [MnIII(3-OMesalophen)(H2O)2]2[MnIII(3-OMesalophen)(H2O)] [Wv(CN)8] • 2H2O

The synthesis, X-ray structure and magnetic properties of a new octacyanotungstate(V) based zero-dimensional [Mn-III(3-OMesalophen)(H2O)(2)](2)[Mn-III(3-OMesalophen)(H2O)] [W-V(CN)(8)] (.) 2H(2)O (1) system are reported. Compound 1 crystallizes in the triclinic system, has space group P1 and unit cell dimensions a = 13.494(2) angstrom, b = 17.080(4) angstrom, c = 18.739(5) angstrom with Z = 2. The structure of 1 consists of the dimeric Mn-NC-W cyano-bridged {[Mn(3-OMesalophen)(H2O)][W(CN)(8)]}(2-) anions and bis-mu-aqua-bridged dimers of [Mn(3-OMesalophen)(H2O)(2)](+) cations linked by H-bonds and pi-pi stacking into (Mn6W2V)-W-III distinguishable structural and magnetic units. The magnetic behavior of 1 correspond to a dominant antiferromagnetic coupling within the cyano-bridged {(MnWV)-W-III}(2-) dimer (J(1) = -20 cm(-1)) and weaker AF coupling between hydrogen bonded moieties (J(2) = -0.46 cm(-1)) with zero-field splitting D parameter of Mn(III) centre in axially distorted surroundings of -4.0 cm(-1). (c) 2005 Elsevier B.V. All rights reserved.