Charge-transfer absorption spectra of some tungsten(VI) and molybdenum(VI) polyoxoanions
Charge-transfer absorption spectra of some tungsten(VI) and molybdenum(VI) polyoxoanions
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DOI：
10.1016/s0277-5387(00)81018-9
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发表时间：
1987
期刊：
影响因子：
2.6
通讯作者：
K. Nomiya;Yoshinobu Sugie;Koichi Amimoto;M. Miwa
中科院分区：
文献类型：
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作者：
K. Nomiya;Yoshinobu Sugie;Koichi Amimoto;M. Miwa
大多数W（VI）和Mo（VI）多氧阴离子在紫外区（30，000 - 50，000 cm-1）的电荷转移（CT）吸收光谱归因于氧到金属的跃迁，基于通过一些八面体单元的边和/或角共享的结构考虑来解释。本文所研究的多氧阴离子根据构成其结构的共同片段分为两类;一个基团含有“M5 O 18”片段[M = W（VI）和Mo（VI）]，例如Weakley型[Ce（IV）（W5 O 18）2]8-阴离子、[W10 O32]4-和[M′ W5 O 19]n-[M′ = V（V），Nb（V），W（VI）]多阴离子，另一种含有A-α-'XM 9 O34'片段（X =杂原子），如Keggin型[α-XM 12 O 40]n−和Dawson型[α-P2 M18 O 62]6−杂多阴离子。第一和第二个最低能量CT（LECT）带的各组定性讨论的CT之间的相互作用的一些片段。
The charge-transfer (CT) absorption spectra in the UV region (30,000–50,000 cm−1) of most W(VI) and Mo(VI) polyoxoanions, attributed to the oxygen-to-metal transitions, are interpreted on the basis of structural considerations through edge- and/or corner-sharings of some octahedral units. Polyoxoanions studied here are classified into two groups according to a common fragment constituting their structures; one group contains an ‘M5O18’ fragment [M = W(VI) and Mo(VI)] such as Weakley-type [Ce(IV)(W5O18)2]8−anion, [W10O32]4−and [M′W5O19]n−[M′ = V(V), Nb(V), W(VI)] polyanions and the other contains an A-α-‘XM9O34’ fragment (X = heteroatom) such as Keggin-type [α-XM12O40]n−and Dawson-type [α-P2M18O62]6−heteropolyanions. The first- and second-lowest energy CT (LECT) bands of the respective group are qualitatively discussed from the CT interactions among some fragments.