SYNTHESIS AND STRUCTURE OF A TETRACOPPER(II) COMPLEX OF A PYRROLE-CONTAINING UNSYMMETRICAL BINUCLEATING LIGAND - [CU(2)L(NCS)(2)](2)

The unsymmetrical binucleating ligand H(2)L (L = C23H29N7) was formed in situ from the condensation of two equivalents of 2-pyrrolecarboxaldehyde with one equivalent of 2,6-bis[N-(3-aminopropyl)aminomethyl]-pyridine. Subsequent addition of two equivalents of copper acetate followed by two equivalents of sodium thiocyanate yielded [Cu(2)L(NCS)(2)](2), bis{[7,7'-pyridine-2,6-diylbis(2,6-diazahept-1-en-1-yl)di-2-pyrrolaro]bis(thiocyanato)dicopper(II)}. The complex exists as a dimer of dicopper(II) units held together by two 1,3-thiocyanate ion bridges.