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Metalloporphyrins. The Nature of Ligand Bonding and the Mechanism of Replacements

Smiljko Ašperger ; Research Center of the Croatian Academy of Sciences and Arts, A. Kovačića 5, 10000 Zagreb, Croatia
Biserka Cetina-Čižmek ; Department of Analytics and Control of Drugs, Faculty of Pharmacy and Biochemistry, University of Zagreb, 10000 Zagreb, Croatia

Puni tekst: engleski, pdf (37 MB) str. 1305-1328 preuzimanja: 125* citiraj
APA 6th Edition
Ašperger, S. i Cetina-Čižmek, B. (1996). Metalloporphyrins. The Nature of Ligand Bonding and the Mechanism of Replacements. Croatica Chemica Acta, 69 (4), 1305-1328. Preuzeto s https://hrcak.srce.hr/135971
MLA 8th Edition
Ašperger, Smiljko i Biserka Cetina-Čižmek. "Metalloporphyrins. The Nature of Ligand Bonding and the Mechanism of Replacements." Croatica Chemica Acta, vol. 69, br. 4, 1996, str. 1305-1328. https://hrcak.srce.hr/135971. Citirano 26.02.2021.
Chicago 17th Edition
Ašperger, Smiljko i Biserka Cetina-Čižmek. "Metalloporphyrins. The Nature of Ligand Bonding and the Mechanism of Replacements." Croatica Chemica Acta 69, br. 4 (1996): 1305-1328. https://hrcak.srce.hr/135971
Harvard
Ašperger, S., i Cetina-Čižmek, B. (1996). 'Metalloporphyrins. The Nature of Ligand Bonding and the Mechanism of Replacements', Croatica Chemica Acta, 69(4), str. 1305-1328. Preuzeto s: https://hrcak.srce.hr/135971 (Datum pristupa: 26.02.2021.)
Vancouver
Ašperger S, Cetina-Čižmek B. Metalloporphyrins. The Nature of Ligand Bonding and the Mechanism of Replacements. Croatica Chemica Acta [Internet]. 1996 [pristupljeno 26.02.2021.];69(4):1305-1328. Dostupno na: https://hrcak.srce.hr/135971
IEEE
S. Ašperger i B. Cetina-Čižmek, "Metalloporphyrins. The Nature of Ligand Bonding and the Mechanism of Replacements", Croatica Chemica Acta, vol.69, br. 4, str. 1305-1328, 1996. [Online]. Dostupno na: https://hrcak.srce.hr/135971. [Citirano: 26.02.2021.]

Sažetak
The imidazole ring is an essential component of many biological systems (hemoglobin and myoglobin, nucleic acids, vitamin B^, cytochromes, metalloenzymes, etc.). The nature of the bond between imidazole-nitrogen and the metal is therefore of biological interest. Imidazole is an electron-donating ligand in both a and n sense, much more electron donating than the majority of nitrogen heterocycles. As ligands, most imidazoles are good a donors and moderate n donors. They can also function as n acceptors if the imidazole ring has one or more electron-withdrawing substituents. Our recent study of bonding modes of pyridine and imidazole type ligands in the transition state of a Conl(protoporphyrin IX) model complex enabled us to conclude that stabilization of the reaction transition state is more sensitive to the change in the strength of n bonding than in that of a bonding. This observation is important for some metallo-enzymatic reactions. Mechanisms of replacements in porphyrin and in corrin rings are discussed.

Hrčak ID: 135971

URI
https://hrcak.srce.hr/135971

Posjeta: 233 *