Copper(II) complexes of N-(2-carbamoylethyl)anthranilic acid H(Ce-anth): Synthesis and crystal structure of {[}Cu(Ce-anth)(2)] center dot 6H(2)O / Skorik YA,Osintseva EV,Neudachina LK,Podberezskaya NV,Romanenko GV,Vshivkov AA // RUSSIAN JOURNAL OF INORGANIC CHEMISTRY. - 2004. - V. 49, l. 3. - P. 386-394.

ISSN/EISSN:

0036-0236 / нет данных

Type:

Article

Abstract:

N-(2-Carbamoylethyl)anthranilic acid H(Ce-anth) was synthesized by 1,4-addition of acrylamide to anthranilic acid. A combination of UV-visible spectrophotometry and pH titration was used to study protolytic equilibria and complex formation with copper(II) ions. In aqueous solution, the H(Ce-anth) proton is located on the carboxy group, and the compound has no zwitterion structure. The acidity constants for H(Ce-anth) are pK(0) = 1.2-1.9 and pK(1) = 4.623 +/- 0.005 (T = 25.0degreesC, I = 0.1 M KNO3). The model of H(Ce-anth) complex formation with copper(II) ions includes two deprotonated complexes: Cu(Ce-anth)(+) and Cu(Ce-anth)(2) with log beta = 4.02 +/- 0.02 and 6.02 +/- 0.07, respectively. In dilute aqueous solution, the CONH2 group does not participate in complex formation. Complex {[}Cu(Ce-anth)(2)] (.) 6H(2)O was synthesized and structurally studied using X-ray crystallography. The crystals are monoclinic, space group P2(1)/n, a = 9.089(2) Angstrom, b = 8.205(2) Angstrom, c = 18.249(4) Angstrom, beta = 101.89(3)degrees, V = 1331.7(5) Angstrom(3), Z = 2, R = 0.0489 for 2508 reflections with I > 2sigma(I). The Cu atom resides at the center of symmetry of a tetragonal bipyramid (4 + 2) formed by two tridentate-chelating (O, N, O) ligands of Ce-anth in fac conformation. The equatorial plane involves the O atoms of two carboxylato groups (Cu-O 1.957 Angstrom) and the amino N atoms (Cu-N 2.016 Angstrom) of the ligands. The apical positions are occupied by the O atoms of propionamide groups (Cu-O 2.406 Angstrom). The OCuN angle in the apical beta-alaninamide copper(II) rings correlates with the Cu-O bond length.

Author keywords:

PERCHLORATE MONOHYDRATE; MOLECULAR-STRUCTURE; LIGANDS; HYDRATE; COORDINATION; CONSTANTS; DIHYDRATE; IONS

DOI:

нет данных

Web of Science ID:

ISI:000220393600013

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	MAR
Publisher	INTERPERIODICA
Address	PO BOX 1831, BIRMINGHAM, AL 35201-1831 USA
Language	English
Keywords-Plus	PERCHLORATE MONOHYDRATE; MOLECULAR-STRUCTURE; LIGANDS; HYDRATE; COORDINATION; CONSTANTS; DIHYDRATE; IONS
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear
ResearcherID-Numbers	Skorik, Yury/A-8128-2008
ORCID-Numbers	Romanenko, Galina/0000-0001-8852-2759
Number-of-Cited-References	40
Journal-ISO	Russ. J. Inorg. Chem.
Doc-Delivery-Number	805VK