Syntheses and X-ray structure analyses of the first bis(chelated) copper and iron bisguanidine

The synthesis of N-1,N-2-bis(1,3-dimethylimidazolidin-2-ylidene)ethane-1,2-diamine and the synthesis and structure determination of bis {N-1,N-2-bis(1,3-dimethylimidazolidin-2-ylidene)ethane- 1,2-diamine}copper(II)-tetraiododicuprate(I) ([Cu(DMEG(2)e)(2)][Cu2I4]) and bis{N-1,N-2-bis(1,3-dimethylimidazolidin-2-ylidene)ethane-1,2-diamine}iron(II)-octacarbonyl-diferrate(-I) ([Fe(DMEG(2)e)(2)][Fe-2(CO)(8)]) which represent the first bis(chelated) bisguanidine complexes are described. The dicationic [M(DMEG(2)e)(2)](2+) molecules with M = Cu, Fe follow the same structural principles and thus differ in their coordination geometries from ideal-typical expectations.