Synthesis, crystal structure, and magnetic properties of hexanuclear [{MnL<SUB>2</SUB>}<SUB>4</SUB>{Nb(CN)<SUB>8</SUB>}<SUB>2</SUB>] and nonanuclear [{MnL<SUB>2</SUB>}<SUB>6</SUB>{Nb(CN)<SUB>8</SUB>}<SUB>3</SUB>] heterometallic clusters (L=bpy, phen)
- Venkatakrishnan, Thengarai S.
- Rajamani, Raghunathan
- Ramasesha, S.
- Sutter, Jean-Pascal
DOIAbstract
A hexanuclear cyano-bridged {MnII4NbIV2} cluster (1) bearing 2,2'-bipyridine (bpy) as the blocking ligand at manganese is obtained from the reaction of cis-[MnCl2(bpy)2] and K4[Nb(CN)8]. When the blocking ligand is 1,10-phenanthroline (phen), a nonanuclear cluster {MnII6NbIV3} (2) is obtained. The structure of [{Mn(bpy)2}4{Nb(CN)8}2] has been solved by single-crystal X-ray crystallography, whereas the phen derivative has been confirmed by means of the structure analysis of the corresponding WIV analogue [{Mn(phen)2}6{W(CN)8}3(H2O)2]. Magnetic measurements revealed S=9 and 27/2 spin ground states for these aggregates as a result of antiferromagnetic Nb-Mn interaction with JNb-Mn=−18.1 cm−1 (1) and −13.6 cm−1 (2)
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