Enhanced and Heteromolecular Guest Encapsulation in Nonporous Crystals of a Perfluorinated Triketonato Dinuclear Copper Complex.

The flexible host framework of a perfluorinated mononuclear copper complex, [Cu(L ) ] (1, HL =3-hydroxy-1,3-bis(pentafluorophenyl)-2-propen-1-one), with a CuO core reversibly encapsulated several organic guest molecules through electrostatic interactions in its crystals. Hence, the corresponding dinuclear complex, [Cu (L ) ] (2, H L =1,5-dihydroxy-1,5-bis(pentafluorophenyl)-1,4-pentadien-3-one), was prepared to enhance guest recognition and the ability to separate molecular mixtures. Complex 2 comprises a Cu O core and four pentafluorophenyl groups.