Rhenium(I) coordinated lumazine and pterin derivatives: structure and spectroelectrochemistry of reversibly reducible (6-ATML)Re(CO)3Cl (6-ATML=6-acetyl-1,3,7-trimethyllumazine)
作者:Sonia B Jiménez-Pulido、Monika Sieger、Axel Knödler、Oliver Heilmann、Matthias Wanner、Brigitte Schwederski、Jan Fiedler、Miguel N Moreno-Carretero、Wolfgang Kaim
DOI:10.1016/s0020-1693(01)00646-6
日期:2001.12
A number of complexes between substituted lumazines (2,4-dioxo-(1H,3H)pteridines) or pterins (2-amino-4-oxo-(3H)pteridines) and Re(CO)(3)Cl have been synthesized and characterized electrochemically and spectroscopically. The structure of the (6-ATML)Re(CO)(3)Cl derivative (6-ATML = 6-acetyl-1,3,7-trimethyllumazine) could be determined in [fac-(6-ATML)Re(CO)(3)Cl]. 3C(6)H(6). The rhenium(I) center coordinates in a rather symmetrical fashion through the O4-N5 alpha -carbonylimino chelate site of 6-ATML; the potentially available acetyl function is not involved in the metal coordination. The acetyl acceptor substituent facilitates the reversible one-electron reduction of this compound to a persistent anion radical complex [(6-ATML)Re(CO)(3)Cl](.-), which is accompanied by variable low-frequency shifts of the six carbonyl stretching bands and by the appearance of a broad EPR signal. (C) 2001 Elsevier Science B.V. All rights reserved.
Selective Oxidation of 6-Acetyl-1,3,7-trimethyllumazine by Nitric Acid
作者:Yonghan Kang、Yeonhee Kim、Jaeseung Kim、Shinho Jang