TETRAPHENYLBORATE ADDUCTS OF LEAD(II) COORDINATED BY IMIDAZOLE-FUNCTIONALIZED 1,4,7-TRIAZACYCLONONANES - CRYSTAL AND MOLECULAR-STRUCTURES

The new functionalized macrocycles ethylimidazol-2-ylmethyl)-1,4,7-tri azacyclononane, L-1, ethylimidazol-2-ylmethyl)-1,4,7-triazacyclononane , L-2, and ,2-bis[4,7-bis(1-methylimidazol-2-ylmethyl)-1,4,7- triazacy clonon-1-yl]ethane, L-3, have been synthesized. The reaction of hydrat ed lead(II) acetate with these compounds in the presence of sodium tet raphenylborate afforded the complexes [(PbLCl)-Cl-1(BPh4)] . 0.5MeCN, [PbL2(BPh4)]BPh4 and [Pb2L3(BPh4)(2)][BPh4](2) . 4MeCN which were char acterized in the solid state by elemental analyses and X-ray crystallo graphy. The lead(II) atoms are co-ordinated by the nitrogens of the ma crocyclic ring, by the nitrogen donor(s) of the pendant imidazole grou p(s) and, in the complex with the L-1 ligand, also by a chlorine atom. In each of the three complexes a phenyl group of a tetraphenylborate anion lies at close contact distance from the lead and completes its c o-ordination.