Mono- and dinuclear zinc(II) complexes of biological relevance. Crystal structures of [L2Zn](PF6)2, [L'Zn(O2CPh)2(H2O)], [L'2Zn2(.mu.-OH)2](ClO4)2, and [L'2Zn2(.mu.-OH)(.mu.-CH3CO2)2](ClO4).cntdot.H2O (L = 1,4,7-triazacyclononane, L' = 1,4,7-trimethyl-1,4,7-triazacyclononane)

The macrocycle 1,4,7-triazacyclononane (C 6 H 15 N 3 ; L) reacts with Zn(II) ions in methanolic solution forming the 2:1 species [L 2 Zn] 2+ . The crystal structure of [L 2 Zn](PF 6 ) 2 (1) has been determined. Crystal data: space group C2/c, a=9.719 (2) A, b=16.312 (3) A, c=15.017 (3) A, β=92.04 (3) o , V=2379.3 (8) A 3 , and Z=4.