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The ppm values, in particular that for the signal of the imine proton, significantly deviate in comparison with the 1H-NMR spectrum of 2 in C6D6 [14]."},{"key":"#cr-split#-10.1016\/S0022-328X(98)00831-6_BIB31.2","unstructured":"(b) 1H-NMR spectrum of 2b (300.11 MHz, THF-d8): \u03b4 (ppm) 8.73 (s, 1H, imine H); 7.18 (d, 3J(H,H)=7.5 Hz, 1H, pyridyl H); 7.16 (d, 3J(H,H)=7.5 Hz, 1H, pyridyl H); 6.71 (t, 3J(H,H)=7.5 Hz, 1 H, pyridyl H); 3.61 (sept, 3J(H,H)=6.5 Hz, 1H, (CH3)2CH); 1.20 (d, 3J(H,H)=6.5 Hz, 6H, (CH3)2CH); \u221211.66 (s, 1H, terminal hydride)."},{"key":"#cr-split#-10.1016\/S0022-328X(98)00831-6_BIB32.1","unstructured":"(a) A.P. Humphries, H.D. 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The LUMO of these complexes possesses a dominant \u03c0* (\u03b1-diimine) character."},{"key":"10.1016\/S0022-328X(98)00831-6_BIB34","doi-asserted-by":"crossref","first-page":"187","DOI":"10.1016\/0010-8545(87)85004-X","volume":"76","author":"Kaim","year":"1987","journal-title":"Coord. Chem. Rev."},{"key":"10.1016\/S0022-328X(98)00831-6_BIB35","doi-asserted-by":"crossref","first-page":"1193","DOI":"10.1351\/pac198658091193","volume":"58","author":"Meyer","year":"1986","journal-title":"Pure Appl. Chem."},{"key":"10.1016\/S0022-328X(98)00831-6_BIB36","unstructured":"\u0394giso=g\u2212ge=g\u22122.0023=k\u03b6(1\/\u0394E1\u22121\/\u0394E2), where \u0394E1 and \u0394E2 are the energy differences between the SOMO and the HOMO and LUMO, respectively. For example see Ref. [32], and P.S. Braterman, J.-I. Song, C. Vogler, W. Kaim, Inorg. 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