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Three new tin(IV) halide complexes with 5,7-dimethyl-8-quinolinol ( dmqo ), Sn( dmqo ) 2 F 2  ( 1 ), Sn( dmqo ) 2 Cl 2  ( 2a  and  2 b ), and Sn( dmqo ) 2 I 2  ( 3 ), have been synthesized and characterized by single-crystal X-ray diffraction, UV-Vis spectroscopy, fluorescence, and thermal analysis. The three crystals are of the monoclinic system with space group  P21/c . A second polymorph of  2  was observed in the space group  C2/c . The Sn(IV) center is six coordinate with two bidentate ligands with N and O donor atoms and two halides in a slightly distorted octahedral geometry. The tin(IV) complexes exhibit parallel displaced packing configuration between 5,7-dimethyl-8-quinolinol ligands. Increasing the size of the halide coordinated with the Sn(IV) center increases molecular packing distortion, resulting in weakening π-π interactions between pyridyl rings. Photoluminescence and thermal properties are affected by halide coordination with tin. The relative quantum yields of Sn( dmqo ) 2 F 2  and Sn( dmqo ) 2 Cl 2  are higher than that of Sn( dmqo ) 2 I 2 . Complexes  1  and  2  show interesting blue-shifted emissions in the solid state compared to solution. Thermal stability decreases in the order of increasing the size of halide coordinated to Sn(IV).

Tin(IV) halide complexes with 5,7-dimethyl-8-quinolinol: structures, optical and thermal properties