1. Stable coordination complexes of α-diimines with Nb(v) and Ta(v) halides.
- Author
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Bartalucci, Niccolò, Bortoluzzi, Marco, Pampaloni, Guido, Pinzino, Calogero, Zacchini, Stefano, and Marchetti, Fabio
- Subjects
METAL complexes ,COORDINATION compounds ,HALIDES - Abstract
Uncommon examples of coordination compounds of high valent transition metals with α-diimines were obtained and characterized by IR and NMR spectroscopy, X-ray diffraction and/or DFT analysis. The 1 : 1 molar reactions of NbF
5 with a selection of α-diimines afforded the ionic compounds [NbF4 (DADR )2 ][NbF6 ] (DADR = DADDip , 1a; DADXyl , 1b; DADMes , 1c) in 80–90% yields. The addition of DADDip to NbOCl3 gave NbOCl3 (DADDip ), 7 (62% yield). [MBr4 (DADDip )][MBr6 ] (M = Nb, 7a; M = Ta, 7b) were afforded in moderate yields from MBr5 and DADDip . The reactions of NbCl5 with DADDip and DADXyl proceeded with non-selective activation of the organic substrate affording complex mixtures of products, including the quinoxalinium salt [{2,6-C6 H3 (CHMe2 )2 }N(CH)2 NCC(CHMe2 )(CH)3 C][NbCl6 ], 2, the Nb(iv) coordination complex NbCl4 (DADDip ), 3, the N-(monoprotonated) α-diimine salts [DADDip (H)][MCl6 ], 4a–b, and the iminomethyl-imidazolium [(2,6-C6 H3 Me2 )NCHCHN(2,6-C6 H3 Me2 )CCHN(2,6-C6 H3 Me2 )][NbCl6 ], 5. [ABSTRACT FROM AUTHOR]- Published
- 2018
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