Synthesis, tunable photophysics and nonlinear absorption of terpyridyl Pt(II) complexes bearing different acetylide ligands. (March 2016)

• Record Type: Journal Article
• Authors: Zhao, Tianchu; Liu, Rui; Shi, Hong; Shu, Mingliang; Hu, Jinyang; Li, Huan; Zhu, Hongjun
• Is Part Of: Dyes and pigments. Volume 126(2016)
• Page Start: 165
• Page End: 172
• Publication Date: 2016-03
• Subjects: Synthesis -- Photophysics -- Terpyridyl Pt(II) complex -- Nonlinear absorption -- Electrochemical property -- Optical limiting; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2015.11.021
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A series of 4-phenyl-2, 2′; 6′, 2″-terpyridyl Pt(II) complexes bearing different σ -alkynyl ancillary ligands (1a –1f ) were synthesized and characterized. All complexes exhibit strong 1 π, π * absorption bands in the UV region; and broad, structureless metal-to-ligand charge transfer ( 1 MLCT)/ligand-to-ligand charge transfer ( 1 LLCT) absorption bands in the visible region. When excited at the charge-transfer absorption band, the complexes exhibit yellow to red luminescence ( λ max = 553–608 nm) in CH3 CN at room temperature, which is attributed to the 3 MLCT/ 3 LLCT state, except1c . The emitting state of1c exhibits a significant intraligand 3 π, π * character, which is originated from the naphthalimide acetylide ligand. Complexes1a –1c exhibit moderate triplet transient absorptions from visible to NIR region, where reverse saturable absorption (RSA) occurs. The photophysical, electrochemical and nonlinear absorption properties of these Pt(II) complexes can be tuned drastically by the different acetylide ligand, which would be useful for rational design of broadband nonlinear absorption materials. Graphical abstract: A series of 4-phenyl-2, 2′; 6′, 2″-terpyridyl Pt(II) complexes bearing different σ -alkynyl ancillary ligands (1a –1f ) were synthesized and characterized. Their photophysical, electrochemical and nonlinear absorption properties can be tuned drastically by the acetylide ligand, which would be useful for rational design of transition-metal complexes for organic light-emitting materials and broadband nonlinear absorption materials. Highlights: A series of terpyridyl Pt(II) complexes were synthesized and characterized. The photophysics and nonlinear absorption of these complexes were investigated. Three complexes exhibit RSA for the ns laser pulses at 532 nm.