A New Preparative Route of the “Stepped‐Cubane” Tetranuclear Copper(II) Compound, [Cu4(μ2‐OH)2(μ3‐OH)2Cl2(bipy)4]Cl2 · 6H2O

The compound Cu₄(μ₂‐OH)₂(μ₃‐OH)₂Cl₂(bipy)₄]Cl₂ · 6H₂O ( 1 ) was obtained by recrystallization of Cu(HB)₂(2, 2′‐bipy)] · H₂O (H₂B = diphenylglycolic acid) from EtOH/CH₂Cl₂ and their structure has been determined by single‐crystal X‐ray analysis. The cationic complex may be described as based on a Cu₄(OH)₄ core with a “stepped cubane” structure. The coordination polyhedron around each copper is a distorted square pyramid. The tetranuclear units are linked in the crystal by C‐H…Cl hydrogen bonds and by π‐π interactions between bipyridine rings. IR data are also presented.