Synthesis of multiply-bonded dichromium complexes with a variety of formamidinate ligands |
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| Affiliation: | 1. Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA;2. Department of Chemistry, Florida Institute of Technology, Melbourne, FL 32901, USA;3. Department of Chemistry, Harvard University, Cambridge, MA 02138, USA;1. Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA;2. Department of Chemistry, Northwest University, Xi’an City 710069, PR China;1. Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA;2. Department of Chemistry, Virginia Tech, Blacksburg, VA 24061, USA;3. State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China;1. Department of Chemistry, Chung Yuan Christian University, Chung-Li, Taiwan, ROC;2. Department of Applied Chemistry, National Pingtung University, Pingtung, Taiwan, ROC |
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| Abstract: | A series of dichromium tetraformamidinate complexes with (ArNCHNAr)− where Ar is X2C6H3 or XC6H4 and X is the remote substituent 3,5-Cl2, 3,4-Cl2, p-Cl, p-CF3, m-CF3, p-OCH3 or m-OCH3 has been synthesized, and the structures of four of the compounds determined by X-ray crystallography. The Cr–Cr bond distances of the complexes structurally characterized are 1.9072(10) Å [Cr2((p-ClC6H4N)2CH)4], 1.9162(10) Å [Cr2((3,5-Cl2C6H3N)2CH)4], 1.9018((8) Å [Cr2((m-CF3C6H4N)2CH)4 ], and 1.9178(11) Å [Cr2((m-OCH3C6H4N)2CH)4]. 1H NMR spectroscopy and electrochemistry were performed on the series. The diamagnetic anisotropy of the Cr–Cr bond was calculated from X-ray crystallographic and 1H NMR data and correlates with the Hammett constant of the formamidine ligands. |
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