STRUCTURES OF NICKEL (II) AND COPPER (II) COMPLEXES WITH TETRAAZA LIGANDS
Kaliyamoorthy Panneerselvam and Tian-Huey Lu
Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 300, R.O.C., Email: thlu@phys.nthu.edu.tw
Keywords: X-ray structures;
Nickel (II) complexes; Copper (II) complexes; Tetradentate
ligands; Microcyclic coordination compounds.
The macromolecules, such as natural heme proteins, chlorophyll and vitamin B12 reveal distinctive coordination chemistry and biological importance of complexes with macrocyclic ligands (ref. 1). Macrocyclic ligand structures control the chemical and physical properties of the metal ions to a remerkable extent and these complexes provide the opportunity to elaborate the coordinated macrocyclic ligands bestowed properties on their metal complexes (ref. 2). Ployaza macrocyclic ligands have attracted interest from coordination chemists, but most attention has been paid to tetradentate macrocyclics; less information being available for larger ring systems. Hence a series of structure determinations of tetradentate ligand complexes have been reported herein. As macrocyclic compounds are of chemical, biological and medical importance, the structures of the compounds of these tetradentate ligands accumulated in the literature, namely 37 Nickel (II) and 32 Copper (II) macrocyclic structures have been included in a statistical analysis of structural parameters of this group of coordination compounds, since 1986. Out of total 69 said metal (II), 23 compounds were solved in our laboratory. We shall analyze and discuss about the coordination bond length, bong angles, conformation and configuration of these 69 compounds. Details of the features are going to present in the meeting time.
We thank the National Science Council,
R.O.C., for support under the grant NSC87-2112-M007-009 and
NSC87-2811-M007-0048.