By reaction of [RhCl2(tren)]+ (tren = tris(2-aminoethyl)amine) with CH3SeCH2CH2NH2 in water in the presence of NaBH4, or in its absence in ethanol, only one of the two geometrical isomers of [Rh(SeCH2CH2NH2)(tren)]2+ was formed. Both of the two geometrical isomers of the corresponding CoIII complex were formed by the reaction of CoII-tren species with (NH2CH2CH2Se-)2. The structure of the RhIII complex was determined by the X-ray method. Crystal data [Rh(C2H6NSe)(C6H18N4)](ClO4)2, monoclinic, space group P21/c, a = 9.012(1), b = 14.438(1), c = 14.550(4) Å, β = 104.81(1)°, and Z = 4. The final R value was 0.026. The complex ion has a distorted octahedral structure with cis(tertiary amine nitrogen, Se) configuration. The RhN bond length for the amine nitrogen bonded trans to the selenium atom is longer by 0.039(6) Å than the average cis RhN distance for the two other primary amine nitrogen of the tren ligand, indicating rans influence of the selenium atom.
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