Zn(II), Cd(II) and Hg(II) complexes of 8-aminoquinoline.: Structure, spectra and photoluminescence property

The reaction of 8-aminoquinoline (8-aq) with M(NO3)2 and M(ClO4)2 (where M = Zn, Cd and Hg) has synthesized complexes of the composition [M(8-aq)2(H2O)2](X)2 (X = NO3, ClO4) whereas MCl2 has isolated M(8-aq)Cl2 type non-ionic compounds. The reaction of M(OAc)2, 8-aq and NaN3/NH4CNS in a 1:1:2 mole ratio has separated polynuclear complexes of the composition [M(8-aq)(Y)2]n (Y = N3, NCS). The complexes have been characterized by spectroscopic data and have been structurally confirmed by single crystal X-ray diffraction study in some representative cases. The X-ray structure of [Zn(8-aq)2(H2O)2](NO3)2 shows C–H–π, and π–π interactions and forms a H-bonded sheet (with interactions between the oxygen of NO3 and C(9)–H of 8-aq/coordinated H2O). A novel one-dimensional cadmium(II) azido complex, [Cd(8-aq)(N3)2]n (9), in which the azido takes on an end-on (EO) bridging mode, has been synthesized and characterized. The presence of π–π interactions result in a supramolecular two-dimensional behaviour for the structure. The complexes are photoluminescent at room temperature.

8-Aminoquinoline (8-aq) reacts with Group 12 salts, and different complexes have been synthesised. The presence of N3− forms an end-on bridging polymer. The complexes show potential emissions. The X-ray structure of some of the complexes exhibit CH–π, and π–π interactions.Figure optionsDownload as PowerPoint slide