COORDINATION OF ,7-TRIS(PYRAZOL-3-YLMETHY)-1,4,7-TRIAZACYCLONONANE WITH IRON(III), NICKEL(II) AND ZINC(II) - CRYSTAL-STRUCTURES AND MOLECULAR-STRUCTURES OF [ML][CLO4](2)CENTER-DOT-NH2O (M=NI, N=0.5, M=ZN, N=1)

The new potentially hexadentate compound 7-tris(pyrazol-3-ylmethyl)-1, 4,7-triazacyclononane (L) has been synthesised. In protonated form, L. 6HCl, it reacted with metal perchlorates to give the complexes [ML][Cl O4](2).nH(2)O (M= Ni, n = 0.5; M = Zn, n = 1) and [FeL][ClO4](3).H2O. The crystal structures of the nickel(II) 1 and zinc(II) 2 complexes ha ve been determined by single-crystal X-ray diffraction: 1, monoclinic, space group C2/c, a = 18.270(4), b = 14.179(6), c = 21.714(4) Angstro m, beta = 115.57(2)degrees, Z = 8; 2 triclinic, space group P (1) over bar, a = 10.322(4), b = 10.563(3), c = 14.60(4) Angstrom, alpha = 92. 61(3), beta = 108.25(3), gamma = 116.07(3)degrees, Z = 2. In both comp lex cations the metal ion is co-ordinated by the six nitrogen donor at oms of the ligand.