• Title/Summary/Keyword: $Mo(dcq)_n(mpd)_{4-n}$

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Studies on the Electrochemical Behaviors, Spectrophotometric Determination of Heavy Lanthanide Ions and Heavy Metal Chelate Complexes with Bidentate Ligands(III) -Synthesis and Characterization of the Tetrakis(5,7-dichloro-8-quinolinato)(2-mercaptopyrimidinato) molybdenum(IV) Complex- (무거운 란탄이온의 전기화학적 거동, 분광학적 정량 및 중금속 이온과 두 자리 리간드 착물에 관한 연구(제 3 보): -테트라키스(5,7-디클로로-8-퀴놀리나토)(2-메르캅토피리미디나토) 몰리브데늄(IV) 착물의 합성 및 특성-)

  • Chang, Choo Hwan;Choi, Won Jong;Park, Keun Su;Son, Pyung Su;Suh, Moo Yul
    • Analytical Science and Technology
    • /
    • v.6 no.5
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    • pp.417-424
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    • 1993

  • Eight-coordinate tetrakis molybdenum(IV) complexes containing 5,7-dichloro-8-hydroxyquinolinol(Hdcq) and 2-mercaptopyrimidine(Hmpd) has been prepared. $Mo(mpd)_4$, $Mo(dcq)(mpd)_3$, $Mo(dcq)_2(mpd)_2$, $Mo(dcq)_3(mpd)$ and $Mo(dcq)_4$ complexes have been isolated by thin-layer chromatography on silicagel plates. These complexes have been charaterized by $^1H-nmr$ spectrum and UV-Vis. spectrum. The chemical shift values of the protons ${\alpha}$ to the nitrogen in the ligands are shifted to down field. The relative intensities of the peaks which are positioned at the same proton of $Mo(dcq)(mpd)_3$ and $Mo(dcq)_3(mpd)$ are observed in 2:1 ratio, in case of $Mo(dcq)_2(mpd)_2$ appears in approximately a 1:1 ratio. The stereochemistry of the complexes in discussed in terms of their nmr spectrum and Orgel's rule. By vertue of the intensities (${\varepsilon}$>10,000~25,000) the low energy($16,600{\sim}19,800cm^{-1}$) bands are observed for the electronic spectra of the complexes are assigned as charge transfer bands.

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