A NEW TETRAAZAMACROCYCLE FUNCTIONALIZED WITH 4 PENDANT PYRIDYL GROUPS- SYNTHESIS AND CRYSTAL-STRUCTURE OF THE NICKEL(II) COMPLEX OF -PYRIDYLMETHYL)-1,4,4,10-TETRAAZACYCLODODECANE(L), [NIL](2+)

The title complex, [NiL](ClO4)(2) was synthesized by the reaction of n ickel(II) perchlorate and the new macrocycle ligand, is(2-pyridylmethy l)-1,4,7,10-tetraazacyclododecane (L) in ethanol solution. The crystal and molecular structure of this complex has been determined by single -crystal X-ray diffraction. The complex consists of [NiL](2+) cation a nd two perchlorate anions. Within the [NiL](2+) cation, the potential octadentate ligand is using its 4 nitrogen atoms of the macrocycle and 2 pyridine nitrogens to coordinate with the central nickel(II), while the other two pyridine nitrogens remained uncoordinated. The central nickel(II) ion is in a distorted-octahedral coordination environment a nd in high-spin state. (C) 1997 Elsevier Science Ltd.