title: [Two-photon sensors for proton derived from 7-pyridinylbenzo[c] [1,2,5]thiadiazole receptor].
abstract: Two new chromophores with carbazole as molecular focal point bearing either one o-pyridine-benzothiadiazole unit or two o-pyridine-benzothiadiazole units at the periphery respectively, named as 2,8-(o-pyridine-benzothiadiazole)-N-ethyl-carbazole (CPTZ1) and 2,8-bis(o-pyridine-benzothiadiazole)-N-ethyl-carbazole (CPTZ2), were synthesized and characterized by IR spectra, 1H NMR spectra and MS. The influence of proton upon one-photon and two-photon fluorescence about these two compounds was discussed. Stern-Volmer equation gives that the S-V constants (k(SV)(1P)) of one-photon fluorescence (1PF) of CPTZ1 and CPTZ2 are 0.04 and 0.10 L mol(-1), respectively; while the k(SV)(2P) of two-photon fluorescence (2PF) of CPTZ1 and CPTZ2 are 0.20 and 0.22 L mol(-1), respectively. Obviously, two-photon (2P) fluorescence detection presented more sensitivity than one-photon (1P) fluorescence response, which exhibits the potential application of two-photon sensor in PH detection.
authors.affiliation: Institute of Chemistry and Materials Science, Soochow University, Suzhou 215123, China. zhaoweifeng1126@163.com
authors.forename: Wei-feng
authors.initials: WF
authors.lastname: Zhao
authors.forename: Xiao-mei
authors.initials: XM
authors.lastname: Wang
authors.forename: Jian-fang
authors.initials: JF
authors.lastname: Luo
authors.forename: Xu-tang
authors.initials: XT
authors.lastname: Tao