Structural characterization of the head-to-head isomers of the [Pd2(Ph2Ppy)2Cl2] and [PtPd(Ph2Ppy)2I2] complexes (Ph2Ppy = 2-(diphenylphosphino)pyridine) |
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| Affiliation: | 1. Chemical Research Center, Hungarian Academy of Sciences, 1525 Budapest, P.O. Box 17, Hungary;2. University of Veszprém, NMR Laboratory, 8201 Veszprém, P.O. Box 158, Hungary;1. South Kazakhstan State University, Shymkent, Kazakhstan;2. School of Pharmacy and Pharmaceutical Sciences and Engineering, Cardiff University, Cardiff, UK;3. School of Engineering, Cardiff University, Cardiff, UK;1. The University of Akron, Good year Polymer Science, Akron, OH 44325, USA;2. Adnan Menderes University, Faculty of Science and Art, Department of Chemistry, 09010 Aydin, Turkey;3. The University of Akron, Department of Chemistry, Akron, OH 44325, USA;1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, 3, Akad. Lavrentiev Ave., Novosibirsk, 630090, Russian Federation;2. Novosibirsk State University, (National Research University), Department of Natural Sciences, 2, Pirogova Str., Novosibirsk, 630090, Russian Federation;3. N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences, 9, Akad. Lavrentiev Ave., Novosibirsk, 630090, Russian Federation;1. Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, PR China;2. Institute of Organic Optoelectronics (IOO), JITRI, Suzhou, Jiangsu 215212, China |
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| Abstract: | The molecular structures of the thermodynamically unstable head-to-head isomers, HH-[Pd2(Ph2Ppy)2Cl2] and HH-[PtPd(Ph2Ppy)2I2], have been determined by single crystal X-ray diffraction. The two complexes have proved to be isostructural. The severe distortions of the bond angles from the ideal square planar geometry around the metal centers ligating the trans phosphorus donor atoms are indicative of a more pronounced internal strain in the HH isomers as compared to the HT counterparts. The enhanced internal strain is thought to be the major driving force responsible for the spontaneous conversion of the head-to-head isomers to their head-to-tail congeners. 13C NMR spectra in solution phase as well as solid-state 31P MAS NMR spectra have proved to be informative regarding the orientation of the asymmetric Ph2Ppy ligands. |
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