Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/12123
Title: Platinum 2,2′:6′,2′-terpyridine complexes as probes for CMC determination of sodium dodecyl sulfate solutions
Authors: Wong, KY 
Lee, WWS
Keywords: Critical micelle concentration
Micellar system
Platinum complexes
Issue Date: 1997
Source: Journal of photochemistry and photobiology A : Chemistry, 1997, v. 102, no. 2-3, p. 231-235 How to cite?
Journal: Journal of Photochemistry and Photobiology A: Chemistry 
Abstract: The platinum complex [Pt(terpy) (OH)]+ (terpy = 2,2′:6′,2′-terpyridine) is a molecular "light switch" for the determination of critical micelle concentration (CMC) in sodium dodecyl sulfate (SDS) micellar system in aqueous solution. No emission from [Pt(terpy) (OH)]+ is observed when the complex is dissolved in water or in very dilute SDS solution but a strong luminescence with emission maximum at 605 nm and excited-state lifetime of 0.1 μs is observed once the SDS concentration reaches the CMC. The emission wavelength of the hydrophobic platinum complex [Pt(mpterpy) (OH2)]2+ (mpterpy = 4′-(p-methoxyphenyl)-2,2′:6′,2′-terpyridine) is also a sensitive parameter for CMC determination. Unlike [Pt(terpy) (OH)]+, [Pt(mpterpy ) (OH2)]2+ has an emission at 720 nm in SDS solution with concentration below CMC. When the concentration of SDS reaches the CMC, there is a sudden, large hypochromic shift of the emission maximum from 720 nm to 610 nm. The emission maximum of [Pt(mpterpy) (OH2)]2+ stays at 610 nm as the SDS concentration increases further beyond the critical micelle concentration.
URI: http://hdl.handle.net/10397/12123
ISSN: 1010-6030
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