title: A perylene bisimide derivative with pyrene and cholesterol as modifying structures: synthesis and fluorescence behavior.
abstract: A perylene bisimide (PBI) derivative (C-PBI-Py) of pyrene (Py) and cholesteryl residue (C) possessing intra-molecular energy transfer properties and three reference compounds (C-Py, C-PBI, PBI-Py) were designed and synthesized, where C was introduced in order to enhance the solubility of the relevant compounds in organic solvents. UV-vis absorption, steady-state fluorescence, cyclic voltammetric and theoretical calculation studies revealed that: (1) the PBI unit and Py moiety of C-PBI-Py could act as two individual chromophores, (2) the excited state energy of Py could transfer to PBI within a single molecule of the compound, and (3) the PBI moiety of the compound tends to form aggregates and shows PBI excimer emission. Time-resolved and temperature-dependent emission spectroscopy studies revealed the presence of both H-type excimer and J-type excimer, and formation of them via either the Birks' scheme or the pre-formed scheme due to strong π-π stacking that was elucidated by concentration-dependent (1)H NMR spectroscopy measurement. In addition, the studies also indicated that the energy transfer occurs via an electron exchange mechanism (Dexter scheme). Results of this study will be useful in the development of new solvatochromic and other environment-sensitive fluorophores based on alteration of intra-molecular energy transfer efficiency.
authors.affiliation: Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, P. R. China. yfang@snnu.edu.cn.
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
authors.affiliation: Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, P. R. China. yfang@snnu.edu.cn.
authors.forename: Weina
authors.initials: W
authors.lastname: Wang
authors.affiliation: Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, P. R. China. yfang@snnu.edu.cn.
authors.forename: Rong
authors.initials: R
authors.lastname: Miao
authors.affiliation: Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, P. R. China. yfang@snnu.edu.cn.
authors.forename: Congdi
authors.initials: C
authors.lastname: Shang
authors.affiliation: Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, P. R. China. yfang@snnu.edu.cn.
authors.forename: Meixia
authors.initials: M
authors.lastname: He
authors.affiliation: Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, P. R. China. yfang@snnu.edu.cn.
authors.forename: Haonan
authors.initials: H
authors.lastname: Peng
authors.affiliation: Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an 710054, P. R. China.
authors.forename: Gang
authors.initials: G
authors.lastname: He
authors.affiliation: Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, P. R. China. yfang@snnu.edu.cn.
authors.forename: Yu
authors.initials: Y
authors.lastname: Fang
mesh_terms: D002784:Cholesterol / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D007094:Imides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010569:Perylene / Q000031:analogs & derivatives* / Q000737:chemistry; D011721:Pyrenes / Q000737:chemistry*; D011789:Quantum Theory; D012997:Solvents / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature; D013816:Thermodynamics
chemical_list: D005456:Fluorescent Dyes; D007094:Imides; D011721:Pyrenes; D012997:Solvents; C510697:perylene bisimide; D010569:Perylene; D002784:Cholesterol; C030984:pyrene