A Novel Coordination Structure of Dichromates Bonding to Copper (II): [Cu(bipy)2(Cr2O7)] · 2 H2O

Abstract Dark‐green multimetal compound crystal [Cu(bipy)2(Cr2O7)]· 2 H2O was obtained from aqueous solution of Cu(NO3)2, K2Cr2O7 and bipyridine. The crystal structure was determined by X‐ray crystallography: triclinic P1, a = 7.716(3) Å, b = 9.656(3) Å, c = 15.517(5)Å, α = 77.41(3)°, β = 81.04(3)°, γ = 82.33(3)°, Z = 2. In this compound, two chromium atoms and a copper atom are linked by two oxo bridges (Cu(II)OCr(VI)OCr(VI)). The copper coordination polyhedron corresponds to a five‐coordinated distorted trigonal bipyramid.