Synthesis and crystal structure of two stereochemical isomers of the trans-dichloro(1,4,8,11-tetraazacyclotetradecane)chromium(III) cation
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abstract
Two stereoisomers of the cationic trans-[Cr(cyclam)Cl2]%2b complex (cyclam = 1,4,8,11-tetraazacyclotetradecane) were prepared and isolated as the nitrate and tetrachlorozincate salts and their structures determined by X-ray diffraction studies of the monoclinic crystals of the nitrate salt, a = 6.480(2), b = 18.862(12), c = 13.628(6) Å, β = 100.28(3)°, and tetragonal crystals for the tetrachlorozincate salt, a = 16.377(4), c = 6.821(2) Å. The two complexes show an octahedral geometry about the metal atoms with the RSSR configuration but with differences in the conformations of the six-membered rings.
