Synthesis,Structures and DFT Studies of Imido‐bridged and (Bis)ligand‐coordinated Titanium Complexes |
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| Authors: | Jian Wu Yanmei Chen Zhou Chen Wei Liu Yahong Li Hao Pei Yonglu Liu Qian Gao Wu Li |
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| Institution: | 1. Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China;2. Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China;3. State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, 730000, China |
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| Abstract: | Syntheses and structures of five imido‐bridged dinuclear titanium complexes and two (bis)ligand‐coordinated mononuclear titanium complexes are reported. Addition of 1 or 2 equiv. of Schiff base ligand (((1H‐pyrrol‐2‐yl)methylene)amino)‐2,3‐dihydro‐1H‐inden‐2‐ol (H2L) to Ti(NMe2)4 resulted in transamination with 4 equiv. of dimethylamides generating a (bis)ligand‐coordinated complex Ti(L)2 ( 1 ). Treatment of Ti(NMe2)4 with 1 equiv. of tBuNH2 followed by addition of 1 equiv. of H2L afforded an imido‐bridged complex Ti(L)(NtBu)]2 ( 2 ). 1:1:1:1 reaction of Ti(NMe2)4/RNH2/H2L/py(or phen) produced imido‐bridgedcomplexes Ti(L)(NPh)(py)]2 ( 3 ), Ti(L)(4‐F‐PhN)(py)]2·Tol ( 4 ·Tol), Ti(L)(4‐Cl‐PhN)(py)]2·Tol·THF ( 5 ·Tol·THF), Ti(L)(4‐Br‐PhN)(py)]2·Tol ( 6 ·Tol) and a (bis)ligand‐coordinated complex Ti(L)2·phen ( 7 ) (py = pyridine, phen = 1,10‐phenanthroline). Attempts to prepare the monomeric titianium imido complexes were unsuccessful. DFT studies show that the assumed compound which contains Ti = N species is less stable than imido‐bridged Ti‐N(R)‐Ti complexes, providing the better understanding of the experimental results. |
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| Keywords: | Titanium Imido‐bridged complexes (Bis)ligand‐coordinated complexes Schiff base ligand DFT studies |
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