title: Reversible mechanochromic luminescence at room temperature in cationic platinum(II) terpyridyl complexes.
abstract: Reversible mechanochromic luminescence in cationic platinum(II) terpyridyl complexes is described. The complexes [Pt(Nttpy)Cl]X2 (Nttpy = 4'-(p-nicotinamide-N-methylphenyl)-2,2':6',2″-terpyridine, X = PF6 (1), SbF6 (2), Cl (3), ClO4 (4), OTf (5), BF4 (6)) exhibit different colors under ambient light in the solid state, going from red to orange to yellow. All of these complexes are brightly luminescent at both room temperature and 77 K. Upon gentle grinding, the yellow complexes (4-6) turn orange and exhibit bright red luminescence. The red luminescence can be changed back to yellow by the addition of a few drops of acetonitrile to the sample. Crystallographic studies of the yellow and red forms of complex 5 suggest that the mechanochromic response is likely the result of a change in intermolecular Pt···Pt distances upon grinding.
authors.affiliation: Department of Chemistry, Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , 96 Jinzhai Road, Hefei 230026, China.
authors.forename: Ali
authors.initials: A
authors.lastname: Han
authors.forename: Pingwu
authors.initials: P
authors.lastname: Du
authors.forename: Zijun
authors.initials: Z
authors.lastname: Sun
authors.forename: Haotian
authors.initials: H
authors.lastname: Wu
authors.forename: Hongxing
authors.initials: H
authors.lastname: Jia
authors.forename: Rui
authors.initials: R
authors.lastname: Zhang
authors.forename: Zhenning
authors.initials: Z
authors.lastname: Liang
authors.forename: Rui
authors.initials: R
authors.lastname: Cao
authors.forename: Richard
authors.initials: R
authors.lastname: Eisenberg