Copper(II) bis(4,4,4‐trifluoro‐1‐phenylbutane‐1,3‐dionate) complexes with pyridin‐2‐one, 3‐hydroxypyridine and 3‐hydroxypyridin‐2‐one ligands: molecular structures and hydrogen‐bonded networks

Copper(II) bis(4,4,4‐trifluoro‐1‐phenylbutane‐1,3‐dionate) complexes with pyridin‐2‐one (pyon), 3‐hydroxypyridine (hpy) and 3‐hydroxypyridin‐2‐one (hpyon) were prepared and the solid‐state structures of (pyridin‐2‐one‐κ O )bis(4,4,4‐trifluoro‐3‐oxo‐1‐phenylbutan‐1‐olato‐κ 2 O , O ′)copper(II), [Cu(C 10 H 6 F 3 O 2 ) 2 (C 5 H 5 NO)] or [Cu(tfpb‐κ 2 O , O ′) 2 (pyon‐κ O )], (I), bis(pyridin‐3‐ol‐κ O )bis(4,4,4‐trifluoro‐3‐oxo‐1‐phenylbutan‐1‐olato‐κ 2 O , O ′)copper(II), [Cu(C 10 H 6 F 3 O 2 ) 2 (C 5 H 5 NO) 2 ] or [Cu(tfpb‐κ 2 O , O ′) 2 (hpy‐κ O ) 2 ], (II), and bis(3‐hydroxypyridin‐2‐one‐κ O )bis(4,4,4‐trifluoro‐3‐oxo‐1‐phenylbutan‐1‐olato‐κ 2 O , O ′)copper(II), [Cu(C 10 H 6 F 3 O 2 ) 2 (C 5 H 5 NO 2 ) 2 ] or [Cu(tfpb‐κ 2 O , O ′) 2 (hpyon‐κ O ) 2 ], (III), were determined by single‐crystal X‐ray analysis. The coordination of the metal centre is square pyramidal and displays a rare example of a mutual cis arrangement of the β‐diketonate ligands in (I) and a trans ‐octahedral arrangement in (II) and (III). Complex (II) presents the first crystallographic evidence of κ O ‐monodentate hpy ligation to the transition metal enabling the pyridine N atom to participate in a two‐dimensional hydrogen‐bonded network through O—H…N interactions, forming a graph‐set motif R 2 2 (7) through a C—H…O interaction. Complex (III) presents the first crystallographic evidence of monodentate coordination of the neutral hpyon ligand to a metal centre and a two‐dimensional hydrogen‐bonded network is formed through N—H…O interactions facilitated by C—H…O interactions, forming the graph‐set motifs R 2 2 (8) and R 2 2 (7).