The reaction of KCa[Cr(C2O2S2)3]·6H 2O (C2O2S2 = dithiooxalate) and [NiL][ClO4]2 (L = racemic 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane) in the 1:3 molar ratio gave a chromium(III)trinickel(II) complex [Cr(C2O2S2)3(NiL) 3][ClO4]3. It crystallizes with two dimethylformamide and two PriOH molecules in the monoclinic space group C2/c, with a = 31.51(1), b = 17.447(6), c = 19.05(1) Å, β = 112.75(4)° and Z = 4. The complex has a CrNi3 core bridged by dithiooxalate groups which bond through sulfur atoms to the Cr and through oxygen atoms to the Ni. The Cr⋯Ni separation is 5.959(5)-5.999(6) Å. The CrS6 entity shows a distortion to a trigonal-prismatic geometry. Each nickel ion assumes a pseudo-octahedral geometry with two oxygen atoms of the C2O2S2 group and four nitrogen atoms of L in a folded form. Cryomagnetic studies (4.2-300 K) revealed a ferromagnetic spin-exchange interaction between the CrIII and NiII (J = +5.9 cm-1 based on ℋ = -2ΣJijŜiŜj).
|Number of pages||5|
|Journal||Journal of the Chemical Society, Dalton Transactions|
|Publication status||Published - Dec 1 1993|
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