Macrocyclic ligand design: Structure-function relationships involving the interaction of pyridinyl-containing, mixed oxygen-nitrogen donor macrocycles with cobalt(II), nickel(II), zinc(II), cadmium(II), silver(I) and lead(II)

Fenton, Ronald R., Gauci, Robert, Junk, Peter C., Lindoy, Leonard F., Luckay, Robert C., Meehan, George V., Price, Jason R., Turner, Peter, and Wei, Gang (2002) Macrocyclic ligand design: Structure-function relationships involving the interaction of pyridinyl-containing, mixed oxygen-nitrogen donor macrocycles with cobalt(II), nickel(II), zinc(II), cadmium(II), silver(I) and lead(II). Dalton Transactions, 2002. pp. 2185-2193.

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Abstract

A comparative investigation of the interaction of three dibenzo-substituted, mixed oxygen–nitrogen donor macrocycles with cobalt(II), nickel(II), copper(II), zinc(II), cadmium(II), silver(I) and lead(II) has been carried out. The thermodynamic stabilities of the respective complexes in 95% methanol (I = 0.1; Et4NClO4, 25 °C) have been determined. All ligands form 1 1 (metal ligand) species with the above metal ions. The results are compared with those obtained previously for related mixed-donor (cyclic) systems. Single crystal structures of six metal complexes of these 20-membered ring ligands have been determined by X-ray diffraction. All of the macrocyclic donor sites participate in binding to the metal ion in the copper(II) and cadmium(II) complexes. The copper complex is six-coordinate, while the cadmium complex is eight-coordinate with the addition of a bidentate nitrato ion. A tri-nuclear complex is formed on complexation with silver(I) in which two silver-containing macrocycles are linked by a bridging two-coordinate silver ion. The metal atoms in each of the cobalt(II), nickel(II) and zinc(II) complexes are six-coordinate, however, they are bound to the macrocycle only at the three secondary amine nitrogen sites. The coordination sphere is completed by two nitrato counterions in the zinc(II) complex, and by a nitrato ion and a methanol molecule in each of the cobalt(II) and nickel(II) complexes.

Item ID: 4418
Item Type: Article (Refereed Research - C1)
Keywords: inorganic chemistry; organic chemistry
ISSN: 1477-9234
Date Deposited: 14 Jun 2009 22:32
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030207 Transition Metal Chemistry @ 33%
03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030503 Organic Chemical Synthesis @ 34%
03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030302 Nanochemistry and Supramolecular Chemistry @ 33%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
Citation Count from Web of Science Web of Science 67
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