Photophysics and nonlinear absorption of cyclometalated 4,6-diphenyl-2,2′-bipyridyl platinum(II) complexes with different acetylide ligands

Rui Liu, Yunjing Li, Yuhao Li, Hongjun Zhu, Wenfang Sun

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Abstract

The photophysical properties of a series of 4,6-diphenyl-2,2′- bipyridyl platinum(II) complexes bearing different σ-alkynyl ancillary ligands (1a-1k) were systematically investigated. All complexes exhibit strong 1π,π* absorption bands in the UV region; and broad, structureless charge-transfer band(s) in the visible region, which systematically red-shift(s) when the electron-donating ability of the para substituent on the phenylacetylide ligand increases. All complexes are emissive in solution at room temperature. When excited at the charge-transfer absorption band, the complexes exhibit long-lived orange emission (λmax: 555 - 601 nm), which is attributed to a triplet metal-to-ligand charge transfer/intraligand charge transfer emission (3MLCT/ 3ILCT). Most of these complexes exhibit broad triplet transient difference absorption in the visible to the near-IR region, with a lifetime comparable to those measured from the decay of the 3MLCT/ 3ILCT emission. The reverse saturable absorption (RSA) of these complexes were demonstrated at 532 nm using nanosecond laser pulses. The degree of RSA follows this trend: 1k ≈ 1a > 1c > 1f ≈ 1i > 1h ≈ 1b > 1e > 1d > 1g, which is mainly determined by the ratio of the triplet excited-state absorption cross section to that of the ground-state and the triplet excited-state quantum yield.

Original languageEnglish
Pages (from-to)12639-12645
Number of pages7
JournalJournal of Physical Chemistry A
Volume114
Issue number48
DOIs
StatePublished - 9 Dec 2010

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