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The complex [La2(-ox){Cr(bipy)((μ-ox)(ox)}4(H2O)6]·12.3(H2O) (C58H68.6N8O54.3Cr4La)2 1 has been obtained from the reaction of La(Ⅲ) salt with [Cr(bipy)(ox)2]-(bipy = 2,2'-bipyridine and ox = oxalate dianion)building blocks in aqueous solution and