A fast time-resolved infrared spectroscopic investigation into the nature of the lowest excited state and excimer formation in PtII diimine cyanides

Marina K. Kuimova, Michael Ya Mel'nikov, Julia A. Weinstein, Michael W. George

Research output: Journal PublicationArticlepeer-review

19 Citations (Scopus)

Abstract

Time-resolved infrared spectroscopy (TRIR) has been used to probe the nature of the lowest excited state of [PtII(dpphen)(CN)2] (dpphen = 4,7-diphenyl-1,10-phenanthroline) both in fluid solution at room temperature and in a glass at 77 K. The positions of the v(CN) bands in [PtII(dpphen)(CN)2] are only slightly (less than 5 cm-1) shifted upon formation of the excited state, thus supporting their assignment as the π-π* intraligand state. At 77 K [PtII(dpphen)(CN)2] has a highly structured luminescence with a lifetime of 170 μs, which is also characteristic of a π-π* excited state. In contrast, the lowest excited state of [Ru(bpy)2(CN)2] has MLCT character in both fluid solution at ambient temperature and at 77 K as shown by a large positive shift of v(CN) relative to the ground state. Also we have monitored the monomer-excimer equilibrium of [PtII(dpphen)(CN)2] in fluid solution using the ns-TRIR technique.

Original languageEnglish
Pages (from-to)2857-2861
Number of pages5
JournalJournal of the Chemical Society. Dalton Transactions
Volume14
DOIs
Publication statusPublished - 2002
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry (all)

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