Synthesis and structural studies of dimethyltin(IV) 5-[(E)-2-(aryl)-1-diazenyl)quinolin-8-olates

Abstract

A series of cis-bis{5-[(E)-2-(aryl)-1-diazenyl]quinolin-8-olato}dimethyltin(IV), Me₂Sn(L)₂, and chloro-{5-[(E)-2-(aryl)-1-diazenyl]quinolin-8-olato}dimethyltin(IV), Me₂SnCl(L), complexes have been synthesized by reacting the sodium salts of 5-[(E)-2-(aryl)-1-diazenyl)quinolin-8-ol (LH) and dimethyltin dichloride in 2:1 and 1:1 molar ratios, respectively. These complexes have been characterized by ¹H, ¹³C, ¹¹⁹Sn NMR in solution and by IR and ¹¹⁹Sn Mössbauer spectroscopy in the solid state. The structures of two of the dimethyltin(IV) complexes, viz., Me₂Sn(L²)₂ (2) and Me₂SnCl(L³).C₇H₈ (6) (L² = 5-[(E)-2-(4′-methoxyphenyl)-1-diazenyl)quinolin-8-olate, L³ = 5-[(E)-2-(4′-ethoxyphenyl)-1-diazenyl)quinolin-8-olate), were determined by single crystal X-ray diffraction. In general, the Me₂Sn(L)₂ complexes were found to adopt a distorted cis-octahedral arrangement, while Me₂SnCl(L) complexes have a distorted trigonal bipyramidal coordination geometry around the tin atom in solution and in the solid state.

Keywords:

• 5-[(E)-2-(aryl)-1-diazenyl]quinolin-8-ol
• Dimethyltin(IV) complexes
• NMR
• ¹¹⁹Sn Mössbauer
• Crystal Structures

Acknowledgements

David Wolstenholme, University of New Brunswick, Canada is thanked for his assistance with the crystal structure determination of compound 6 during an exchange visit to the University of Zurich. The financial support of the Department of Science & Technology, New Delhi, India (Grant No. SR/S1/IC-03/2005,TSBB), the University Grants Commission, New Delhi, India through SAP-DSA, Phase-III and Indo-Swiss Joint Research Programme, Joint Utilisation of Advanced Facilities (Grant No. JUAF 11, TSBB, AL) are gratefully acknowledged.