Platinum(II) complexes with aryl tellurols and diaryl ditellurides: Syntheses and spectral investigations |
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| Affiliation: | 1. Department of Chemistry, School of Physical Sciences, Doon University, Dehradun 248012, India;2. Institute of Nuclear Medicine and Allied Sciences, DRDO, Brig. SK Majumdar Marg, Delhi 110054, India;1. Center for Advanced Analytical Science, Guangzhou Key Laboratory of Sensing Materials and Devices, Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials and Devices, c/o School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, PR China;2. School of Pharmaceutical Sciences (Shenzhen), Shenzhen Campus of Sun Yat-sen University, Shenzhen, 518107, PR China |
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| Abstract: | Arytellurol complexes [PtCl(TeAr)(PPh3)2] (I) and [Pt(TeAr)2(PPh3)2] (II) are readily obtained from cis-[PtCl2(PPh)3)2] and NaTeAr (Ar = C6H5, 4-CH3OC6H4 and 4-CH3CH2OC6H4) in ethanolbenzene at room temperature. 31P NMR spectra of (I) and (II) indicate their trans configuration in solution. Metathetical reactions between I (Ar = 4-CH3OC6H4) and NaX (X = I, Br, SCN) occur in methanol to give [Pt(X)(TeC6H4OCH3-4)(PPh3)2]. 1H NMR shows that equimolar proportions of NaTeC6H5, NaTeC6H4OCH2CH3-4 and cis-[PtCl2(PPh3)2] give a mixture of three complexes: II, Ar = C6H5; II, Ar = 4-CH3CH2OC6H4; and [Pt(TeC6H5)(TeC6H4OCH2CH3-4)(PPh3)2]. Polymeric complexes [PtCl(TeAr)]n (III) and [Pt(TeAr)2]n (IV) result from reaction between K2[PtCl4] and NaTeAr in aqueaous ethanol. They react with excess of PPh3 in CDCl3 to yield monomeric complexes I and II respectively which were characterized in situ by 1H and 31P NMR of the reaction mixtures. IR spectra indicate the presence of bridging chloride ligands in III. An alternating chloride and tellurol bridged chain structure for III and a tellurol bridged for IV have been proposed. Reaction between equimolar amounts of III and PPh3 in dichloromethane yielded a tellurol bridged dimeric complex [PtCl(μ-TeAr)(PPh3)]2 (V) with terminal chloride ligand as suggested by IR study. Ethanolic solutions of diarylditellurides also react readily with an aqueous solution of K2[PtCl4] at 10 °C to give complexes for which the structure trans-[PtCl2(ArTeTeAr)2] (VI) is suggested from their elemental analyses, IR, Raman (in one case only), 1H, 125Te (in one case only), and 195Pt NMR spectra and reactions with triphenylphosphine which liberated free ditellurides. At 40 °C or above the same ditellurides form polymeric complexes III with K2[PtCl4] in aquaeous ethanol. |
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