Thermal studies N-(2-aminoethyl)-1,3-propanediamine and N-(3-aminopropyl)-1,3-propanediamine complexes of cadmium(II)
作者： Arunendu Mondal , Chandi Pariya , Ashutosh Ghosh , Nirmalendu Ray Chaudhuri
DOI: 10.1016/0040-6031(96)02972-3
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摘要: Abstract [Cd(aepn) 2 ]X · n H O (where aepn is N -(2-aminoethyl)-1,3-propanediamine, and = 1 when X Cl − Br , 0 0.5SO 2− 4 0.5SeO NO 3 I ), Cd(aepn)X SCN Cd(dpt)X dpt -(3-aminopropyl)-1,3-propanediamine, ) have been synthesised investigated thermally in the solid state. The species Cd(aepn)Cl Cd(aepn)SO Cd(aepn)SeO also pyrolytically state from corresponding parent bis-complexes. Cd(aepn) (SCN) Cd(dpt) melt on heating exist as supercooled liquids at ambient temperature. On after deaquation, Cd(dpt)SO ·H shows two endothermic phase transitions (172–190°C, ΔH 8.0 kJ mol −1 210–245°C, 3.5 low-temperature transition reversible (182–165°C, −7.8 ). Conversely, selenate analogue undergoes an irreversible (240–257°C, 13.2 ] (NO Cd(aepn)I show (198–218°C, 5.9 for nitrate, 195–202°C, 8.3 iodide). are assumed to be due conformational changes triamine chelate rings. thermal stabilities rationalized with respect carbon chain lengths of ligands.
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