Mononuclear and unsymmetric dinuclear complexes of the tripodal ligand 2-hydroxyethyl-bis(2-{pyrid-2-yl}ethyl)amine
摘要:
Reaction of bis(2-{pyrid-2-yi} ethyl) amine with 2-bromoethanol in the presence of Na2CO3 yields the title ligand, LH. Treatment of LH with the CuBr2 or Zn(O2CMe)(2) center dot 2H(2)O yields pure crystalline [CuBr(LH)]Br center dot H2O (1 center dot H2O) and [Zn-2(O2CMe)(2)(mu-O2CMe)(mu-L)] (2). Reaction of LH with Cu(O2CMe)(2) H2O affords a low yield Of [Cu2Cl2(mu-O2CMe)(mu-L)] (3), the Cl- ligands apparently originating from the CH2Cl2 crystallization solvent. Compound 1 center dot H2O is a near-regular square-pyramidal complex with a neutral, protonated LH ligand. In contrast, 2 and 3 are both unusual unsymmetric dinuclear complexes, with a five-coordinate [ML(O2CMe)] (M = Zn or Cu) unit linked to a second metal ion through the deprotonated ligand alkoxide donor and O,O'-bridging acetate ligand. (c) 2007 Elsevier B.V. All rights reserved.