Bi-Nuclear Metal Complexes of 2,6-Bis(1,4,7-triazacyclonon-1-yl-methylene) pyridine with Zinc(II), Copper(II), and Nickel(II)

作者：Coghlan Campbell J; Campi Eva M; Forsyth Craig M; Jackson Roy W; Hearn Milton T W^*

来源：Australian Journal of Chemistry, 2015, 68(7): 1115-1121.

DOI：10.1071/CH14618

The coordination chemistry of 2,6-bis(1,4,7-triazacyclonon-1-ylmethyl) pyridine (L-pyx, 1) has been investigated and shown to yield bi-nuclear metal complexes in the presence of zinc(II), copper(II), or nickel(II) ions. The reaction of (L-pyx). 7HCl (2) with Zn(NO3)(2) gave the monomeric [Zn-2(mu-Cl)(2)(L-pyx)(H2O)](ClO4)(2) (3) in which the ligand encapsulates a Zn-2(mu-Cl)(2) moiety. Similar treatment of 2 with Cu(NO3)(2) gave a bi-nuclear complex cation which exists as a 1 : 1 co-crystal {[Cu(Cl)(L-pyx) Cu(mu-Cl)(Cl)](BF4)(H2O)}(2) and {[Cu(Cl)(L-pyx) Cu(mu-Cl)(H2O)](BF4)(2)(H2O)}(2) (4) with two discrete Cu-II centres bridged by the L-pyx ligand and dimerised through an unsymmetrical Cu-2(mu-Cl)(2) interaction. Similarly, reaction of 2 with Ni(NO3)(2) also gave a dimeric complex {[Ni(Cl)(mu-Cl)(L-pyx) Ni(NO3)(H2O)](PF6)}(2) (5) containing two discrete Ni-II centres with dimerisation occurring through a symmetrical Ni-2(mu-Cl)(2) interaction. In all cases, the L-pyx ligand binding is unsymmetrical between the two metal centres being tridentate to one and tetradentate to the other through an additional coordination of the pyridyl linker.

• 出版日期2015