2 research outputs found

    Influence of the Pt -> Ag donor-acceptor bond and polymorphism on the spectroscopic and optical properties of heteropolynuclear benzoquinolateplatinum(II) complexes

    No full text
    10 pages, 8 figures, 5 tables.A new cyclometalated derivative, (NBu4)[Pt(bzq)(C6Cl5)2] (2) (bzq = 7,8-benzoquinolate), and three novel polymetallic species containing donor鈭抋cceptor Pt鈫扐g bonds, (NBu4)[{Pt(bzq)(C6F5)2}2Ag] (3) and [{Pt(bzq)(C6X5)2}Ag(PPh3)] (X = F (4), Cl (5)), have been synthesized and characterized by X-ray diffraction methods. 3 is prepared by reaction of (NBu4)[Pt(bzq)(C6F5)2] (1) with AgClO4 in 1:1 or 1:0.5 molar ratio, while 4 and 5 are the results of the reaction of the corresponding (NBu4)[Pt(bzq)(C6X5)2] (X = F (1), Cl (2)) precursors with [Ag(OClO3)(PPh3)] in 1:1 molar ratio. 3 has been found to crystallize in two forms: monoclinic (3a) and triclinic (3b), which differ not only in the conformation of the basic Pt2Ag anion (anti and planar 3a, staggered and nonplanar 3b), but also in the crystal packing (蟺路路路蟺 extended structure 3a, and a stacked dimer 3b) and luminescence at 298 K (orange 3a, green 3b). At 77 K, the orange band (568 nm) of 3a, attributed to a 蟺蟺* excimeric emission, is not detected, and both polymorphs exhibit identical green emission (3LC/3MLCT). Spectroscopic study of 4 and 5 (UV鈭抳is and luminescence) was also performed to examine the role of the Pt鈫扐g donor鈭抋cceptor bond. The most significant feature is the blue shift observed in the low-energy UV absorption and the appearance of two, close, distinct, structured emissions with short (487 4; 490 nm 5) and long (502 nm 4, 5) lifetime, but only in the solid state at 77 K.Financial support has been obtained from the Ministerio de Ciencia y Tecnolog铆a and FEDER (Project CTQ2005-08606-C02-01, 02) and the Diputaci贸n General de Arag贸n (Grupo de Excelencia). S.I. and J.T. thank the Ministerio de Educaci贸n y Ciencia and the CAR, respectively, for a grant.Peer reviewe

    Influence of the Pt -> Ag donor-acceptor bond and polymorphism on the spectroscopic and optical properties of heteropolynuclear benzoquinolateplatinum(II) complexes

    No full text
    10 pages, 8 figures, 5 tables.A new cyclometalated derivative, (NBu4)[Pt(bzq)(C6Cl5)2] (2) (bzq = 7,8-benzoquinolate), and three novel polymetallic species containing donor鈭抋cceptor Pt鈫扐g bonds, (NBu4)[{Pt(bzq)(C6F5)2}2Ag] (3) and [{Pt(bzq)(C6X5)2}Ag(PPh3)] (X = F (4), Cl (5)), have been synthesized and characterized by X-ray diffraction methods. 3 is prepared by reaction of (NBu4)[Pt(bzq)(C6F5)2] (1) with AgClO4 in 1:1 or 1:0.5 molar ratio, while 4 and 5 are the results of the reaction of the corresponding (NBu4)[Pt(bzq)(C6X5)2] (X = F (1), Cl (2)) precursors with [Ag(OClO3)(PPh3)] in 1:1 molar ratio. 3 has been found to crystallize in two forms: monoclinic (3a) and triclinic (3b), which differ not only in the conformation of the basic Pt2Ag anion (anti and planar 3a, staggered and nonplanar 3b), but also in the crystal packing (蟺路路路蟺 extended structure 3a, and a stacked dimer 3b) and luminescence at 298 K (orange 3a, green 3b). At 77 K, the orange band (568 nm) of 3a, attributed to a 蟺蟺* excimeric emission, is not detected, and both polymorphs exhibit identical green emission (3LC/3MLCT). Spectroscopic study of 4 and 5 (UV鈭抳is and luminescence) was also performed to examine the role of the Pt鈫扐g donor鈭抋cceptor bond. The most significant feature is the blue shift observed in the low-energy UV absorption and the appearance of two, close, distinct, structured emissions with short (487 4; 490 nm 5) and long (502 nm 4, 5) lifetime, but only in the solid state at 77 K.Financial support has been obtained from the Ministerio de Ciencia y Tecnolog铆a and FEDER (Project CTQ2005-08606-C02-01, 02) and the Diputaci贸n General de Arag贸n (Grupo de Excelencia). S.I. and J.T. thank the Ministerio de Educaci贸n y Ciencia and the CAR, respectively, for a grant.Peer reviewe
    corecore