A Unique μ‐dichloro‐Bridged Butterfly‐shaped Dimer: Synthesis and Crystal Structure of [Cu(bpmh)Cl₂]₂ (bpmh=2,2′‐bipyridyl‐3‐carbomethoxy‐3′‐formylhydrazine), Roles of π–π Interaction and Steric Hindrance Effect in Crystal Packing

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