Thermal studies of N1-isopropyl-2-methyl-1,2-propanediamine complexes of zinc (II) and cadmium (II) in the solid phase

Pariya, Chandi ; Ghosh, Ashutosh ; Ganguli, Sarmishtha ; Chaudhuri, Nirmalendu Ray (1994) Thermal studies of N1-isopropyl-2-methyl-1,2-propanediamine complexes of zinc (II) and cadmium (II) in the solid phase Thermochimica Acta, 242 . pp. 195-205. ISSN 0040-6031

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0040-6031(94)85021-6

Abstract

CdL3(ClO4)2, ZnL2X2, CdL2X′2• nH2O (where L is N1-isopropyl-2-methyl-l,2-propane-diamine, X is Cl, Br, I, ClO4, SCN, 0.5SO4 and 0.5SeO2; n = 0 when X′ is Cl, Br, I, SCN and 0.5SO4; n = 3 when X′ is ClO4; n = 4 when X′ is 0.5SeO4) and MLX2 (M is Zn(II) or Cd(II) and X is Cl, Br and I) were synthesized from solution. The species CdL2(ClO4)2 and MLX2,(M is Zn(II) or Cd(II) and X is Cl, Br and I) were synthesized from the corresponding parent complexes by the temperature-arrest technique. CdL2(SCN) 2 exists in two isomeric forms and both have been synthesized. One of the isomers undergoes an irreversible phase transition (102–120°C, ΔH = 12.8 kJ mol−1) and transforms to the other form in the solid phase. ZnL2(ClO4)2 shows a reversible phase transition (178–208°C, ΔH = 9.2 kJ mol−1) upon heating in the solid phase. CdL2(ClO2)2 undergoes a reversible phase transition (73–98°C, ΔH = 4.4 kJ mol−1) and then on further heating shows time-dependent reversible phase transitions (136–190°C, ΔH = 15.3 kJ mol−1) in the solid phase. The phase transition in CdL2(SCN) 2 is due to the change in coordination mode of the thiocyanate ion, whereas in CdL2(ClO4)2, the time-dependent reversible phase transition is due to conformational changes in the diamine chelate rings.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Coupled Technique; Cadmium Compound; Diamine; DTA; Isomer; Phase Transition; TG; XRD; Zinc Compound
ID Code:108451
Deposited On:13 Oct 2017 13:01
Last Modified:13 Oct 2017 13:01

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