Synthesis and characterization of divalent metal complexes containing the heteroscorpionate ligand dihydrobis(3-carboxyethyl-5-methylpyrazolyl)borate

The dihydrobis(3-carboxyethyl-5-methylpyrazolyl)borate ligand, BpCOOET,Me, reacts with divalent metals to yield complexes of general type [(BpCOOET,Me)2M], where M = Mn(II), Fe(II), Co(II), Ni(II), Zn(II), Cu(II), Pb(II) and Cd(II). A single crystal structural characterization is reported for [Cu(BpCOOET,Me)2] and [Zn(BpCOOET,Me)2], where the metals are four-coordinated and only bound to the nitrogen atoms of the ligand.