Two cyanide-bridged compounds composed of Schiff base-manganese(III) building block with dicyanamido and hexacyanocobaltate(III) as ligands: Crystal structure, thermostability and magnetic property

Two new cyanide-bridged compounds, [Mn(L)(mu(1,3)-N(CN)(2))](n) (1) and {[Mn-2(L)(2)(H2O)(2)]K(H2O)(2)Co(CN)(6)}(n) (2). (H2L = N,N'-bis-5-chloro-salicylidene)-1,2-diaminoethane), are synthesized and structurally characterized. Single-crystal X-ray diffraction analysis reveals that compounds 1 and 2 are composed of interesting 1D chain-like structure in which the manganese center is hexa-coordinated in the distorted octahedral geometry. In compound 1, Mn(III) ions are bridged by N(CN)(2) ligands with mu(1,3) modes, while two CN groups in Co(CN)(6)(3) ligand bridge two Mn(III) ions leading to a heterometallic trinuclear unit in compound 2, several of the units are further connected by the linkage of CN groups and K(I) ions to form the chain-like structure. TGA results indicate that two compounds possess excellent thermostabilities. Magnetic measurement demonstrates that compounds 1 and 2 perform antiferromagnetic interaction with the coupling parameters (J) of 0.722 and 0.849 cm(-1), respectively. Magneto-structural correlation has been discussed as well. (C) 2014 Elsevier B.V. All rights reserved.