Synthesis and characterization of bimetallic ruthenium complexes with (CH)6 and related bridges

Treatment of RuHCl(CO)(PPh3)(3) with (E)-HCdropCCH=CHCdropCH produces [RuCl(CO)-(PPh3)(2)](2)(mu-(E,E,E)-CH=CHCH=CHCH=CH). The latter complex reacts with PMe3, 4-phenylpyridine (PhPy), and 2,6-(Ph2PCH2)(2)C5H3N (PMP) to give [RuCl(CO)(PMe3)(3)](2)(mu-CH=CHCH=CHCH=CH), [RuCl(CO)(PhPy)(PPh3)(2)](2)(mu-CH=CHCH=CHCH=CH), and [RuCl-(CO)(PMP)](2)(mu-CH=CHCH=CHCH=CH), respectively. Treatment of [RuCl(CO)(PPh3)(2)](2)(mu-(E,E,E)-CH=CHCH=CHCH=CH) with t-BuNC and NaBPh4 gives {[Ru(t-BuNC)(3)(PPh3)(2)](2)(mu-COCH=CHCH=CHCH=CHCO)}(BPh4)(2), the structure of which has been confirmed by X-ray diffraction. Treatment of RuHCl(CO)(PPh3)(3) with excess (Z)-HCdropCCH=CHCdropCH followed by PMe3 produces RuCl((E,Z)-CH=CHCH=CHC=CH)(CO)(PMe3)3- The mononuclear complex reacts with RuHCl(CO)(PPh3)(3) to give (PMe3)(3)(CO)ClRu-CH=CHCH=CHC-(=CH2)-RuCl(CO)(PPh3)(2), which reacts with t-BuNC to give [(PMe3)(3)(CO)ClRu-CH= CHCH=CHC(=CH2)CO-Ru(t-BuNC)(3)(PPh3)(2)]Cl.