title: Uniting Ruthenium(II) and Platinum(II) Polypyridine Centers in Heteropolymetallic Complexes Giving Strong Two-Photon Absorption.
abstract: New trinuclear RuPt2 and heptanuclear RuPt6 complex salts are prepared by attaching Pt(II) 2,2':6',2"-terpyridine (tpy) moieties to Ru(II) 4,4':2',2":4",4"'-quaterpyridine (qpy) complexes. Characterization includes single crystal X-ray structures for both polymetallic species. The visible absorption bands are primarily due to Ru(II) → qpy metal-to-ligand charge-transfer (MLCT) transitions, according to time-dependent density functional theory (TD-DFT) calculations. These spectra change only slightly on Pt coordination, while the orange-red emission from the complexes shows corresponding small red-shifts, accompanied by decreases in intensity. Cubic molecular nonlinear optical behavior has been assessed by using Z-scan measurements. These reveal relatively high two-photon absorption (2PA) cross sections σ2, with maximal values of 301 GM at 834 nm (RuPt2) and 523 GM at 850 nm (RuPt6) when dissolved in methanol or acetone, respectively. Attaching Pt(II)(tpy) moieties triples or quadruples the 2PA activities when compared with the Ru(II)-based cores.
authors.affiliation: School of Chemistry, Huaihai Institute of Technology , Cangwu Road, Lianyungang 222005, P. R. China.|School of Chemistry, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.|School of Chemistry, Anhui University , Jiulong Road, Hefei 230601, P. R. China.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Shi
authors.affiliation: School of Chemistry, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Coe
authors.affiliation: School of Chemistry, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.
authors.forename: Sergio
authors.initials: S
authors.lastname: Sánchez
authors.affiliation: School of Chemistry, Liaocheng University , Hunan Road, Liaocheng 252000, P. R. China .
authors.forename: Daqi
authors.initials: D
authors.lastname: Wang
authors.affiliation: School of Chemistry, Anhui University , Jiulong Road, Hefei 230601, P. R. China.
authors.forename: Yupeng
authors.initials: Y
authors.lastname: Tian
authors.affiliation: Advanced Materials Engineering and Modelling Group, Faculty of Chemistry, Wrocław University of Technology , Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Nyk
authors.affiliation: Advanced Materials Engineering and Modelling Group, Faculty of Chemistry, Wrocław University of Technology , Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland.
authors.forename: Marek
authors.initials: M
authors.lastname: Samoc