title: [Spectroscopic study on 2, 6-bis (diphenylphosphino) pyridine Ag(I) complex].
abstract: The spectroscopic properties of a three-coordinate Ag(I) photoluminescent complex [Ag2(mu-PNP)3](ClO4)2, PNP = 2, 6-bis(diphenylphosphino)pyridine, were studied. The electronic shoulder absorptions of the complex around 260 and 300 nm have been assigned to l-->a kappa (l stands for lone-pair electron and a kappa for anti-bonding orbital of pyridyl) transitions, respectively. In acetonitrile, the complex exhibited luminescence with an emission peak at 525 nm upon excitation with UV-Vis light at room temperature. The excited state was intraligand in nature. The photophysical properties of the complex, altering in the presence of different guest molecules, such as AuPPh3Cl, AgCF3SO3 and [Cu(CH3CN)4](ClO4), were explored by using electronic absorption and emission spectrometry. In the complex, the ligand PNP and Ag(I) ions formed an open cavity and were capable of binding a second, different ion. The substantial change of photophysical properties in the presence of different guest molecules suggests that [Ag2(mu-PNP)3](ClO4)2 can be used as a probe or sensor for these guest ions.
authors.affiliation: Department of Chemistry, Shantou University, Shantou 515063, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Li
authors.forename: Tao
authors.initials: T
authors.lastname: Wu
authors.forename: Zhi-Ming
authors.initials: ZM
authors.lastname: Zhe