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Volumn 35, Issue 13, 1996, Pages 3792-3803

Dinuclear nickel(II) complexes as models for the active site of urease

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EID: 0001542285     PISSN: 00201669     EISSN: None     Source Type: Journal    
DOI: 10.1021/ic951567x     Document Type: Article
Times cited : (152)

References (89)
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    • 2/3 kT) (2kT/D) + 2 exp(-D/kT)/(D/kT) + exp(-D/kt)/ 1 + 2 exp(-D/kT)
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    • For magnetic susceptibility measurements the compounds were powdered and dried under high vacuum in order to remove the solvent molecules which are included in the crystal lattice. We cannot rule out the possibility of changes in the coordination of the Ni(II) ions due to the treatment of the samples, e.g. the terminally coordinated oxygen donors O(6) in the structures of 2 and 3 may become bridging ligands or dissociate off
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    • The primary structure of the ureases from P. mirabilis, H. pylori, K. aerogenes, and jack beans have a common conservative sequence of 20 amino acid residues. Among those three histidine residues are found that are expected to be directly coordinated to the metal ions; cf. ref 5
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    • The detection of mononuclear complexes of the ligands tbpOH, m-tbpOH, and bpepOH could not be proven by the electronic absorption spectra, which are dominated by the intense CT transitions of the cyclic polymers. Our experiences with complex formation with this kind of ligand show that mononuclear complexes are formed preferentially if no bridging anions are present that stabilize the dinuclear unit (vide infra).
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    • The use of substrates that contain activated leaving groups has been criticized repeatedly. However, the broad use of the mentioned test substrates allows us to compare the hydrolysis efficiency of different model systems and thus has set its own standard, (a) Menger, F. M: Ladika. M. J. Am. Chem. Soc. 1987, 109, 3145. (b) Breslow, R.; Singh, S. Bioorg. Chem. 1988, 16, 408.
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