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ESTIMATING THE STABILITY OF METAL–LIGAND BONDING IN CARBOXYL-CONTAINING POLYMER COMPLEXES BY IR SPECTROSCOPY
Journal of Structural Chemistry ( IF 0.8 ) Pub Date : 2020-12-01 , DOI: 10.1134/s0022476620120057
T. V. Berestova , K. N. Nosenko , O. V. Lusina , L. G. Kuzina , E. I. Kulish , A. G. Mustafin

The stability of metal–ligand (carboxyl-containing polymer (CCP)) bonding in transition metal complexes is estimated and juxtaposed using Δν(COO) values. The Δν(COO) value is determined from the difference between stretching vibrations of the carboxylate ion in the IR spectra. It is shown that Δν(COO) values for transition metal complexes with ethylenediaminetetraacetic acid (EDTA) increase in the order that directly depends on the order of their stability in the series Fe3+ > Cr3+ > Cu2+ > Ni2+ > Co2+ > Mn2+. The established relationship between the Δν(COO) value and the stability of metal complexes is used to determine the series of metal affinity for carboxyl-containing biopolymers such as citrus pectin (CP) and chitosan succinate (CS). The obtained data indicate that the affinity for metal corresponds to series Cr3+ > Cu2+ > Co2+ > Mn2+ > Ni2+ for citrus pectin (CP) and to series Cu2+ > Cr3+ ≈ Ni2+ ≈ Co2+ > Mn2+ for chitosan succinate (CS).

中文翻译:

通过红外光谱估计含羧基聚合物复合物中金属-配体键合的稳定性

过渡金属配合物中金属-配体(含羧基聚合物(CCP))键合的稳定性使用Δν(COO)值估计和并列。Δν(COO) 值由红外光谱中羧酸根离子的伸缩振动之间的差异确定。结果表明,过渡金属与乙二胺四乙酸 (EDTA) 配合物的 Δν(COO) 值增加的顺序直接取决于它们在系列 Fe3+ > Cr3+ > Cu2+ > Ni2+ > Co2+ > Mn2+ 中的稳定性顺序。Δν(COO) 值与金属配合物稳定性之间建立的关系用于确定金属对含羧基生物聚合物如柑橘果胶 (CP) 和壳聚糖琥珀酸酯 (CS) 的一系列亲和力。所得数据表明对金属的亲和力对应于系列 Cr3+ >
更新日期:2020-12-01
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