Barreto Wagner J, Ando Romulo A, Santos Paulo S, Silva Waleria P
Laboratory of Environmental Physical Chemistry, Department of Chemistry, CCE, Londrina State University, Londrina, PR, Brazil.
Spectrochim Acta A Mol Biomol Spectrosc. 2007 Nov;68(3):612-8. doi: 10.1016/j.saa.2006.12.037. Epub 2006 Dec 27.
An UV-vis, Raman, IR and EPR spectroscopic study was performed for the water soluble complexes of Fe(III), Ni(II), Co(II) and Zn(II) coordinated to dioxolene ligands derived from oxidized dopamine. The complexes were obtained and stabilized at neutral pH by the strong reducing agent sodium thiosulfate. Iron(III) stabilizes the ligand in catecholate form as [Fe(III)(Cat)2]1-, Cat=dopacatecholate, and the divalent metals as dopasemiquinone (SQ): [Ni(SQ)3]1-, [Co(SQ)3]1- and [Zn(SQ)3]1-. The resonance Raman spectra of the solid complexes as [CAT][Ni(SQ)3], [CTA][Co(SQ)3] and [CTA][Zn(SQ)3], CTA is the cetyltrimethylammonium, are very similar to the spectra of the complexes in solution, while the Fe(III) complex is a mixture of two iron complexes, with catecholate or dopasemiquinone ligands.
对与氧化多巴胺衍生的二氧戊环配体配位的Fe(III)、Ni(II)、Co(II)和Zn(II)的水溶性配合物进行了紫外可见光谱、拉曼光谱、红外光谱和电子顺磁共振光谱研究。通过强还原剂硫代硫酸钠在中性pH下获得并稳定了这些配合物。铁(III)以[Fe(III)(Cat)2]1-（Cat = 多巴儿茶酚盐）的形式将配体稳定为儿茶酚盐形式，而二价金属则以多巴半醌（SQ）形式存在：[Ni(SQ)3]1-、[Co(SQ)3]1-和[Zn(SQ)3]1-。固体配合物[CAT][Ni(SQ)3]、[CTA][Co(SQ)3]和[CTA][Zn(SQ)3]（CTA为十六烷基三甲基铵）的共振拉曼光谱与溶液中配合物的光谱非常相似，而Fe(III)配合物是两种铁配合物的混合物，配体为儿茶酚盐或多巴半醌。
