Abstract
New cadmium complexes of 4-methoxyphenyl dithiophosphinic acids, H3CO-C6 H 4-(R)PS2H were prepared. The five dithiophosphinato ligands (L) involved were of the general structure H3CO-C6 H 4-(R)PS\(_{\mathrm {2}}^{\mathrm {-}}\) with R = 3-methylbutyl, (L1); n-butyl, (L2); 2-methylpropyl, (L3); 1-methylpropyl, (L4) and 2-propyl, (L5). To the best of our knowledge, this is the first report on the preparation and characterization of the n-butyl- derivative. The acid forms of the ligands were obtained by treatment of the Lawesson reagent, (LR) [2,4-bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulfide] with the corresponding Grignard reagent in dry diethylether. The acids formed were transformed into easily crystallizable ammonium salts (NH4L) for purification. These salts were treated with CdCl2 in ethanol at room temperature to produce the bis-dithiophosphinato cadmium complexes ([Cd(L)2]2) exclusively. The structures of the complexes were elucidated by elemental analysis, MS, FTIR and Raman spectroscopy techniques as well as 1H-, 13C- and 31P- NMR. The crystal structures of [Cd(L1)2]2 and [Cd(L2)2]2 were also studied as examples. X-ray studies confirmed the nonplanar, four-coordination geometry of the complexes and indicate that electron delocalization prevails in the PS\(_{\mathrm {2}}^{\mathrm {-}}\) moiety of the dithiophosphinato groups.
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Acknowledgements
We gratefully acknowledge the financial assistance of Technical Research Council of Turkey (grant nos. TBAG 114Z091, TUBITAK) and Research and Application Centers of Bozok University (BAP2015 FEF/A153). Our thanks also go to the tutors of the Zurich School of Crystallography, for assistance and guidance with the data collection and structure determination of compound [Cd(L1)2]2 and Prof. Davit Zargarian, Chemistry Department of the Université de Montréal for their support with the X-ray facility for [Cd(L2)2]2.
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All additional information relating to the characterization of the complexes, namely, ESI-MS (figure 1), IR spectra (figure S2), Raman spectra (figure S3), NMR (1H, 13C and 31P) spectra (figures S4, S5 and S6) are available at www.ias.ac.in/chemsci. Crystallographic data (excluding structure factors) have been deposited with the Cambridge Crystallographic Data Centre as the supplementary publication no. 1060403 (for [Cd(L1)2]2, and CCDC 1060404 (for [Cd(L2)2]2). Copies of the data can be obtained, free of charge, on application to CCDC, 12 Union Road, Cambridge CB2 1EZ, UK (fax: + 44-1223-336033; E-mail: deposit@ccdc.cam.ac.uk).
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SAĞLAM, E.G., ACAR, N., SÜZEN, Y. et al. Syntheses and structural characterization of new dithiophosphinato cadmium complexes. J Chem Sci 127, 1653–1663 (2015). https://doi.org/10.1007/s12039-015-0930-y
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DOI: https://doi.org/10.1007/s12039-015-0930-y