Transition metal complexes of amidinourea and related ligands part III. Infrared spectra and thermal decomposition studies on metal complexes of O-alkyl-1-amidinoureas |
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Authors: | Arun Syamal Vinay D. Ghanekar |
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Affiliation: | (1) Department of Applied Sciences and Humanities, Kurukshetra University, Kurukshetra, 132119 Haryana, India;(2) Present address: Department of Chemistry, Regional Engineering College, Kurukshetra, 132119 Haryana, India |
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Abstract: | Summary The i.r. spectral data on O-methyl-l-amidinourea hydrochloride,O-ethyl-1-amid inourea hydrochloride and the metal complexes [M = copper(H), nickel(II), palladium(II), zinc(II) and oxovanadium(IV)] ofO-methyl-l-amid inourea andO-ethyl-l-amidinourea are reported. The spectral results suggest that secondary amine nitrogens are the donor atoms inO-alkyl-1-amid inourea. The free ligands and the complexes exhibit a characteristic band at ca. 1100 cm–1 due to the C-OR group. The i.r. and electronic spectral data on the hydrated and anhydrous uncharged metal complexes indicate that the hydrated uncharged metal complexes ofO-alkyl-l-amidinourea may be represented as [M(AAU)n]] · xH20 and not as [M(AAUII)n](OH)n · xH2O [where AAU = H2NC(=NH)NC(=NH)OR and AAUH = H2NC(=NH)NHC(=NH)OR, R = Me, Et]. The use of the term anhydrobase is confusing and suitable names for various metal complexes ofO-alkyl-l-amid inourea are suggested. The main decomposition stage in metal complexes ofO-ethyl-l-amidinourea occurs at lower temperatures than for the corresponding biguanide complexes indicating that the former are less stable than the latter. |
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