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A series of near infrared (NIR) absorbing dinuclear ruthenium dicarbonylhydrazine complexes (DCH-Ru),[{Ru(bpy)2}2μ-DCH]n+ (where bpy = 2,2'-bipyridine and n = 2, 3 or 4), were prepared. The DCH-Ru complexes are electrochromic in the NIR region with a