The first rigid-rod cluster-containing σ-alkynyl polymers E-[({Pt6}-CC-Ar-CC)]x-{Pt6}-E [(3), {Pt6} ) Pt6(μ-PBut2)4(CO)4, E ) end group; Mn ) 22 000-38 000] have been prepared by step-growth polycondensation of {Pt6}Cl2 and 1,4-didodecyl-2,5-diethynylbenzene (HCC-Ar-CCH) under Sono- gashira-type conditions. The monodisperse oligomers HCC-Ar-CC-({Pt6}CC-Ar-CC)x-{Pt6}-CC- Ar-CCH [(4) x ) 0; (11) x ) 2; (15) x ) 4] were also prepared by stepwise procedures, still based on Cu(I)-catalyzed dehydrohalogenation reactions. A red-shift of the UV-vis absorption centered at ca. 470 nm, on increasing chain length, suggests some degree of electron delocalization along the backbone.
Covalent Rigid-Rod Organometallic Polymers with Alternating Transition Metal Clusters and Conjugated Spacers in the Main Chain
LEONI, PIERO;MARCHETTI, LORELLA;RUGGERI, GIACOMO;
2006-01-01
Abstract
The first rigid-rod cluster-containing σ-alkynyl polymers E-[({Pt6}-CC-Ar-CC)]x-{Pt6}-E [(3), {Pt6} ) Pt6(μ-PBut2)4(CO)4, E ) end group; Mn ) 22 000-38 000] have been prepared by step-growth polycondensation of {Pt6}Cl2 and 1,4-didodecyl-2,5-diethynylbenzene (HCC-Ar-CCH) under Sono- gashira-type conditions. The monodisperse oligomers HCC-Ar-CC-({Pt6}CC-Ar-CC)x-{Pt6}-CC- Ar-CCH [(4) x ) 0; (11) x ) 2; (15) x ) 4] were also prepared by stepwise procedures, still based on Cu(I)-catalyzed dehydrohalogenation reactions. A red-shift of the UV-vis absorption centered at ca. 470 nm, on increasing chain length, suggests some degree of electron delocalization along the backbone.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
