MULTINUCLEAR NMR-STUDY OF COMPLEXATION OF D-GALACTARIC AND D-MANNARIC ACIDS WITH TUNGSTEN(VI) OXOIONS

被引：25

作者：

RAMOS, ML

CALDEIRA, MM

GIL, VMS

VANBEKKUM, H

PETERS, JA

机构：

[1] UNIV COIMBRA,DEPT CHEM,P-3000 COIMBRA,PORTUGAL

[2] LAB ORGAN CHEM & CATALYSIS,2628 BL DELFT,NETHERLANDS

来源：

JOURNAL OF COORDINATION CHEMISTRY | 1994年 / 33卷 / 04期

关键词：

COMPLEXES; TUNGSTEN(VI); SUGAR DERIVATIVES; D-GALACTARIC ACID; D-MANNARIC ACID; THREO AND ERYTHRO CONFIGURATIONS;

D O I：

10.1080/00958979408024292

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The coordination compounds formed between W(VI) and D-galactaric and D-mannaric acids, in aqueous solution, have been studied by H-1, C-13, O-17 and W-183 NMR spectroscopy. In the pH range 3-8 for D-galactaric acid and 2-10 for D-mannaric acid, the acids are found to form n:n species (mainly 2:2) with tungstate, in which the ligands are bound to the metal by the two carboxylate groups and their adjacent OH groups. Above pH 6.5, a 2:1 species is also formed, in which all the OH functions are coordinated to the metal, the two carboxylate groups remaining free. The formation of symmetrical or asymmetrical species is discussed, taking into account the configuration of the ligands. Structures for the various complexes are formulated.

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页码：319 / 329

页数：11

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