Add time:07/13/2019         Source:sciencedirect.com

[Ru(bpy)2(bqdiBr2)](PF6)2 ([1](PF6)2, bpy = 2,2′-bipyridyl, bqdiBr2 = 3,6-dibromo-1,2-benzoquinone diimine) was synthesized by the reaction of 3,6-dibromo-1,2-phenylenediamine with [RuCl2(bpy)2] in air, and the reactivity of [1](PF6)2 in Pd-catalyzed cross-coupling reactions with metalated thiophene and benzene was investigated. The structure of [1](PF6)2 was determined using X-ray crystallography. The Migita–Kosugi–Stille cross-coupling of [1](PF6)2 with 2 equiv of Th-SnBu3 (Th = 2-thienyl; Bu = butyl) afforded a 3,6-di(2-thienyl)-1,2-benzoquinone diimine (Th-C6H2(NH)2-Th)-coordinated Ru(II) complex [2](PF6)2. Similarly, the Suzuki–Miyaura cross-coupling of [1](PF6)2 with 2 equiv of CH3OC6H4-B(OH)2-p proceeded smoothly to afford a p-CH3OC6H4-C6H2(NH)2-C6H4OCH3-p-coodinated Ru(II) complex, [3](PF6)2. The optical and electrochemical properties of these complexes were evaluated based on the presence of the extended π-conjugated diimine ligand in the diimine moiety. The Stille cross-coupling of [1](PF6)2 with 1 equiv of Me3Sn-C4H2S-SnMe3 (C4H2S: thiophene-2,5-diyl) afforded a π-conjugated polymer consisting of the [Ru(bpy)2(bqdi)]2+ units.

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