Infrared spectra of N,N′-bis(salicylidene)-1,1-(dimethyl)ethylenediamine and its metal complexes
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2019, Journal of Molecular StructureCitation Excerpt :The intense sulphur peak may be caused due to higher molecular weight than those other elements (Fig. 4). (2): (E)-2-((4-boronobenzylidene)amino)terephthalic acid demonstrates significant vibrations verifying the structure in infrared spectrum such carbonyl (CO) stretching at 1693 cm−1 [74–76]; Schiff base stretching (CN) at 1627 cm−1 [77–80]; BO-H stretching at 3350 cm−1 and carbonyl OH stretching at 2843 cm−1 [58,59,81]; BO 1346 cm−1 [46,47]; 1124 cm−1 BC; 3062 cm−1 aromatic CH stretching [48–51] (Fig. 2). The electronic absorption spectrum demonstrates two bands assignable to π → π* at 211 nm and 264 nm; n → π* transitions at 291 nm and 363 nm [60–65].
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2015, Journal of Saudi Chemical SocietyCitation Excerpt :IR, 1H NMR and 13C NMR spectroscopic data are in good agreement with their proposed structure. A displacement of a νOH band from region 3650–3500 cm−1 to 3350–2800 cm−1 may be due to an internal hydrogen bridge OH⋯NC (Ueno and Martell, 1956; Faniram et al., 1974). The band sometimes remained undetected if a strong hydrogen bond exists.
Reductive and oxidative electrochemical study and spectroscopic properties of nickel(II) complexes with N<inf>2</inf>O<inf>2</inf> Schiff bases derived from (±)-trans-N,N′-bis(salicylidene)-1,2-cyclohexanediamine
2014, Electrochimica ActaCitation Excerpt :During the whole electrolysis process at this potential, there were no other changes observed (Fig. 8). Reports dealing with oxidation of derivatives of phenol and phenolate anions [38a,42] prove one-electron oxidation of this compounds to phenoxyl radicals, which may undergo dimerization or, at higher potentials, they are oxidised to very short-lived phenoxonium cations. Consequently, oxidation process of phenoxyl radicals to phenoxonium cations is irreversible and the peak on reverse curve rarely is observed [43].