Copper(II) complexes with N-(2-carboxyethyl)anthranilic acid H(2)CEAnt. Synthesis and crystal structure of {[}Cu(CEAnt)(H2O)]center dot H2O / Skorik YA,Osintseva EV,Podberezskaya NV,Virovets AV,Neudachina LK,Vshivkov AA // RUSSIAN CHEMICAL BULLETIN. - 2005. - V. 54, l. 7. - P. 1563-1568.

ISSN/EISSN:

1066-5285 / нет данных

Type:

Article

Abstract:

Protolytic equilibria and complexation of N-(2-carboxyethyl)anthranilic acid (H(2)CEAnt) with copper(II) ions in aqueous solutions were studied by UV spectroscopy and pH potentiometry. The H(2)CEAnt compound has no zwitterionic structure, and the protons are localized on the carboxy groups. The acid ionization constants of H(3)CEAnt(+) (T=25 degrees C, I=0.1 M KNO3) are pK(0)=1.3 +/- 0.2 (=NH2+), pK(1)=3.88 +/- 0.02 (Alk-COOH), and pK(2)=5.28 +/- 0.02 (Ar-COOH). The model of complexation of H(2)CEAnt with copper(II) ions involves two deprotonated complexes {[}Cu(CEAnt)] and {[}Cu(CEAnt)(2)](2-) (log beta=6.31 +/- 0.04 and 8.0 +/- 0.2, respectively). The {[}Cu(CEAnt)(H2O)]center dot H2O complex was synthesized by the reaction of H(2)CEAnt with (CuOH)(2)CO3, and its structure was established by X-ray diffraction. The coordination polyhedron of Cu is intermediate between the tetragonal pyramid and trigonal bipyramid. The CEAnt(2-) ligand serves as a tetradentate chelating bridging ligand (Cu-O, 1.944(3) and 1.950(3) angstrom; Cu-O', 2.195(4) angstrom; Cu-N, 2.016(5) angstrom), and the fifth position of the polyhedron is occupied by a water molecule (Cu-O-w 1.976(4) angstrom).

Author keywords:

N-(2-carboxyethyl)anthranilic acid; beta-alanine; aza-Michael reaction; acid ionization constants; copper(II) complexes; crystal structure ANTHRANILIC ACID; SPECTROPHOTOMETRIC DETERMINATION; DIHYDRATE; LIGAND

DOI:

10.1007/s11172-006-0004-x

Web of Science ID:

ISI:000234790700004

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUL
Publisher	CONSULTANTS BUREAU/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013 USA
Language	English
Keywords-Plus	ANTHRANILIC ACID; SPECTROPHOTOMETRIC DETERMINATION; DIHYDRATE; LIGAND
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Multidisciplinary
Author-Email	skorik@pitt.edu ev\_osinceva@mail.ru podberez@che.nsk.su
ResearcherID-Numbers	Skorik, Yury/A-8128-2008
ORCID-Numbers	Virovets, Dr. Alexander/0000-0002-8843-8503
Number-of-Cited-References	25
Usage-Count-Since-2013	5
Journal-ISO	Russ. Chem. Bull.
Doc-Delivery-Number	004ZG