Cu2+, Zn2+, and Ni2+ Complexes of C2-Symmetric Pseudopeptides with an Aromatic Central Spacer
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Other documents of the author: Lingaraju, Gorla; Martí-Centelles, Vicente; Freimuth, Lena; Altava, Belen; Burguete, M. Isabel; Luis, Santiago V.
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http://dx.doi.org/10.1021/acs.inorgchem.6b01066 |
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Title
Cu2+, Zn2+, and Ni2+ Complexes of C2-Symmetric Pseudopeptides with an Aromatic Central SpacerAuthor (s)
Date
2016Publisher
American Chemical SocietyISSN
0020-1669; 1520-510XType
info:eu-repo/semantics/articlePublisher version
http://pubs.acs.org/doi/abs/10.1021/acs.inorgchem.6b01066Subject
Abstract
Two new tetradentate C2-symmetric pseudopeptidic
ligands derived from Val and Phe containing two
amino and two amido groups and a central o-substituted
aromatic spacer have been prepared. Their complexes with
Cu2+, ... [+]
Two new tetradentate C2-symmetric pseudopeptidic
ligands derived from Val and Phe containing two
amino and two amido groups and a central o-substituted
aromatic spacer have been prepared. Their complexes with
Cu2+, Zn2+, and Ni2+ have been studied by potentiometry,
UV−vis spectrophotometry, FT-IR, and ESI-MS. The presence
of the aromatic spacer provides Cu2+ complexes with stability
constants several orders of magnitude higher than those
observed for related ligands containing aliphatic central
spacers. Besides, the formation of [MH−2L] complex species
is favored. Crystal structures for the corresponding Cu2+ and
Ni2+ have been obtained, revealing the metal atom in an
essentially square-planar geometry, although, in several
instances, the oxygen atom of an amide carbonyl of a second complex species can act as a fifth coordination site. In the case
of Zn2+, the only crystal structure obtained displays a square-pyramidal arrangement of the metal center. Finally, preliminary
experiments show the catalytic activity of some of these complexes, in particular, Zn2+ complexes, for epoxide ring-opening with
using aniline as the nucleophile in a ligand accelerated process. [-]
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Inorg. Chem., 2016, 55 (15), pp 7617–7629Rights
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