trans-Bis(3-amino­flavone-κ²N,O)bis(perchlorato-κO)copper(II), a new potential anti­tumour agent

The title compound, trans-bis­(3-amino-2-phenyl-4H-1-benzopyran-4-one-κ²N,O⁴)bis­(perchlorato-κO)copper(II), [Cu(ClO₄)₂(C₁₅H₁₁NO₂)₂], is composed of mononuclear units wherein the central Cu^II cation occupies a crystallographic inversion centre. The cation is coordinated by two bidentate 3-­amino­flavone ligands occupying the equatorial sites and by two perchlorate anions in the apical positions, thereby giving rise to a markedly elongated octa­hedral coordination geometry. Two symmetry-related inter­molecular N—H...O hydrogen bonds link the mol­ecules into chains of rings running parallel to the [100] direction, while intra­molecular N—H...O hydrogen bonds help to determine the orientation of the apical perchlorate anions.

2'-(4-Chloro­phen­yl)-2,3,4,5,6,7-hexa­hydro-4',7'-methano­spiro­[9H-fluorene-9,3'-1H-indazole]-1'-carbo­nitrile and methyl 4'-chloro-2'-(4-chloro­phen­yl)-1'-cyano­spiro­[9H-fluorene-9,3'-pyrazolidine]-4'-carboxyl­ate

The title compounds, C₂₇H₂₂ClN₃, (IV), and C₂₄H₁₇Cl₂N₃O₂, (V), were synthesized as part of our ongoing studies on (2+3)-cyclo­addition reactions. Compound (V) crystallizes with two mol­ecules in the asymmetric unit. The pyrazolidine ring of compound (IV) adopts a twisted conformation, while in compound (V) it adopts a twisted and an envolope conformation in the two molecules. There are short inter­molecular contacts, which can be recognized as unconventional hydrogen bonds, in both structures.