期刊
INORGANICA CHIMICA ACTA
卷 358, 期 2, 页码 389-395出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2004.08.012
关键词
emission; near ir; osmium; complex
A large bathochromic shift (greater than or equal to50 nm) and emission in the near infrared is observed by attaching arylethynyl groups at the 3,8-positions of the 1,10-phenanthroline ligand (phen) of [Os(bipy)(2)(phen)](2+) (where bipy = 2,2'-bipyridine). Thus [Os(bipy)(2)(3,8-di-4-methoxyphenylethynyl-1,10-phenathroline)](2+) emits at 795 nm, while [Os(bipy)(2)(3,8-diphenylethynyl-1,10-phenanthroline)](2+) emits at 815 nm. According to this trend it would have been expected that [Os(bipy)2(3,8-di-4-nitrophenylethynyl-1,10-phenathroline)](2+) emits farther in the near infrared. Nevertheless, this complex is not photoluminescent because of intramolecular electron transfer quenching of the MLCT excited state by the nitroaromatic group. These results set structural and redox potential standards in the design of near infrared emitters based on [Os(bipy)(2)(phen)](2+) type complexes. Published by Elsevier B.V.
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