Synthesis and characterization of chromium and tungsten tetracarbonyl bound to the bridging ligand 2,3-bis(2-pyridyl)pyrazine (dpp) |
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| Affiliation: | 1. Department of Chemistry, Aligarh Muslim University, Aligarh, 202002, India;2. Department of Chemistry, Indian Institute of Technology Guwahati, 781039, India;3. Institute of Industry Academy Cooperation Foundation, Dongguk University, Gyeongju, Republic of Korea;4. Department of Advanced Materials Chemistry, Dongguk University, Gyeongju, Republic of Korea;1. Centro de Investigação em Química, Department of Chemistry and Biochemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal;2. Instituto de Ciências Biomédicas Abel Salazar, ICBAS, University of Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal;1. Ruđer Bošković Institute, NMR Centre, Bijenička cesta 54, HR-10000 Zagreb, Croatia;2. University of Rijeka, Department of Biotechnology, Radmile Matejčić 2, HR-51000 Rijeka, Croatia;3. Slovenian NMR Centre, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia;4. EN-FIST Center of Excellence, Trg OF 13, SI-1000 Ljubljana, Slovenia;5. University of Ljubljana, Faculty of Chemistry and Chemical Technology, Večna pot 113, SI-1000 Ljubljana, Slovenia;6. University of Zagreb, Faculty of Science, Department of Chemistry, Horvatovac 102a, HR-10000 Zagreb, Croatia;1. Laboratoire Physico-Chimie de l''Etat Solide, LR11 ES51, Faculté des Sciences de Sfax, Université de Sfax, 3071 Sfax, Tunisia;2. Laboratoire de Spectroscopie Atomique Moléculaire et Applications, Faculté des Sciences de Tunis, Université Tunis-El-Manar II, 1060 le Belvédère, Tunisia;1. Institute of Physical and Organic Chemistry, Southern Federal University, 194/2 Stachki st., Rostov-on-Don 344090, Russian Federation;2. A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 28 Vavilov st., Moscow 119991, Russian Federation |
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| Abstract: | The synthesis, electronic absorption, infrared and 13C NMR spectra, and electrochemistry of [Cr(CO)4]dpp and [W(CO)4]dpp (dpp = 2,3-bis(2-pyridyl)pyrazine) are reported. Electronic absorption spectra in different solvents show solvatochromic behavior and indicate the metal to ligand charge transfer (MLCT) excited state is lower in energy than the ligand field (LF) excited state. Electrochemical results show the [Cr(CO)4]dpp complex undergoes semi-reversible one electron oxidation, while [W(CO)4]dpp undergoes irreversible one electron oxidation. 13C NMR spectra of both complexes show all carbons in the metal-bound dpp ring shift downfield. The amount of downfield shift for the series [M(CO)4]dpp (M = Cr, Mo, W) is interpreted as indicating better M dπ → dpp pπ backbonding occurs for Mo and W than for Cr. |
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