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通过测定Co~Ⅱ、Co~Ⅲ、Ni~Ⅱ、Cu~Ⅱ-EDTA螯合物的折射率得到各盐的克分子折射度,并根据离子折射度的加合性算出螯合离子Co~ⅡY~(2-)、Co~ⅢY~-、Ni~ⅡY~(2-)、Cu~ⅡY~(2-)的离子折射度,结果表明:1.同一种螯合离子在不同晶体中,其离子折射度值保持常数,说明离子间的极化是不显著的,因而用折射度法研究它们的结构是可能的。2.从三个Co~ⅡY~(2-)和四个Co~ⅢY~-的碱金属盐得到这两种螯合离子的折射度是相同的(69.6厘米~3),与Ni~ⅡY~(2-)和Cu~ⅡY~(2-)的折射度(64.5厘米~3)相差很大,说明Co~ⅡY~(2-)具有和Co~ⅢY~-相似的六啮结构,而不同于Ni~Y~(2-)和Cu~ⅡY~(2-)的五啮结构。3.螯合离子结构改变引起折射度显著地变化,而中心阳离子的电子数改变对整个螯合离子折射度的影响很小。
By measuring the refractive index of Co ~ Ⅱ, Co ~ Ⅲ, Ni ~ Ⅱ, Cu ~ Ⅱ-EDTA chelates, the refractive index of each salt was obtained and the chelating ion Co ~ ⅡY was calculated according to the additivity of ion refractive index ~ (2 -), Co ~ ⅢY ~ -, Ni ~ ⅡY ~ (2 -) and Cu ~ ⅡY ~ (2-) were studied. The results showed that: 1. The same chelate ion in different crystals, The values of ion refraction remain constant, indicating that the polarization between ions is insignificant, and therefore it is possible to study their structure using refractive indices. The refractive indices of the two chelating ions obtained from the three Co ~ IIY ~ (2-) and four Co ~ IIIY ~ ~ Alkali salts are the same (69.6 cm ~ 3) (2-) and Cu ~ IIY ~ (2-) have a large difference in refractive index (64.5 cm ~ 3), indicating that Co ~ ⅡY ~ (2-) has a hexahedral structure similar to that of Co ~ ⅢY ~ The five-ring structure of Ni ~ Y ~ (2-) and Cu ~ IIY ~ (2-). 3. The change of the chelating ion structure caused the refractive index to change significantly, while the change of the electron number of the center cation has little effect on the refractive index of the chelate ion.