Carbonylchromium Monotelluride Complexes [Et4N] 2[Te{Cr(CO)5}n (n = 2, 3): Two Important Intermediates

Minghuey Shieh*, Li Fang Ho, Yu Wen Guo, Shu Fen Lin, Yi Chun Lin, Shie Ming Peng, Yi Hung Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The first isolation of the monotelluride-bridged chromium carbonyl complexes [Et4N]2[Te-{Cr(CO)5}n] (n = 3, [Et4N]2[1]; n = 2, [Et4N]2[2]) has been achieved from the reaction of Te powder with 3 equiv of Cr(CO) 6 in the presence of [Et4N]Br in concentrated KOH/EtOH solution. According to X-ray analysis, anion 1 displays a pyramidal geometry with the Te atom bonded to three Cr(CO)3 fragments and anion 2 exhibits a nonlinear structure with the Te atom coordinated with two Cr(CO) 5 moieties. Complex 1 can transform to 2 in the presence of Cr(CO)6/KOH/EtOH solution. Conversely, 2 can convert back to 1 upon the reaction with Cr(CO)6 in MeCN. Interestingly, the novel C-O activation of MeOH is observed when 1 was treated with NaOH/MeOH solution at 70 °C, giving the Te-methylated product [Et4N] [MeTe{Cr(CO) 5}2] ([Et4N][3]). Complex 2 is reactive toward some organic solvents. It can react with CH2Cl2 to form the CH2-bridged tetrachromium complex [Et4N] 2[CH2{TeCr2-(CO)10}2] ([Et4N]2[4]) and can transform to the known tetrachromium tritelluride complex [Et4N]2[Te3{Cr(CO) 5}4], in MeOH solution. Besides, we also found that 2 can undergo oxidative coupling with [Cu(MeCN)4]BF4 in MeOH to form the dimeric open cluster [Te2{Cr(CO)5} 4]2- and can react with NaOH in MeOH to give the dimeric ring complex [Te2Cr4(CO)18]2-. Complexes 1-4 are fully characterized by spectroscopic methods and single-crystal X-ray analysis. This paper describes that complexes 1 and 2 are important intermediates for a series of tellurium-containing polychromium complexes, and the interesting structural features of the resultant new polychromium carbonyl complexes are compared as well.

Original languageEnglish
Pages (from-to)5020-5026
Number of pages7
Issue number24
Publication statusPublished - 2003 Nov 24

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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