Chelation versus binucleation: metal complex formation with the hexadentate all-cis-N1,N2-bis(2,4,6-trihydroxy-3,5-diaminocyclohexyl)ethane-1,2-diamine.

The hexadentate ligand all-cis-N(1),N(2)-bis(2,4,6-trihydroxy-3,5-diaminocyclohexyl)ethane-1,2-diamine (L(e)) was synthesized in five steps with an overall yield of 39% by using [Ni(taci)(2)]SO(4).4H(2)O as starting material (taci=1,3,5-triamino-1,3,5-trideoxy-cis-inositol). Crystal structures of [Na(0.