Calorimetric study and thermal analysis of [Ho-2(Ala)(4)(H2O)(8)]Cl-6 and [ErY(Ala)(4)(H2O)(8)] (ClO4)(6)
Liu, BP; Tan, ZC; Nan, ZD; Liu, P; Sun, LX; Xu, F
Keyword[Ho-2(Ala)(4)(H2o)(8)]Cl-6 [Ery(Ala)(4)(H2o)(8)](Clo4)(6) Adiabatic Calorimetry Heat Capacity Thermal Decomposition
Indexed BySCI
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
AbstractTwo solid complexes of rare-earth compounds with alanine, [HO2(Ala)(4)(H2O)(8)] Cl-6 and [ErY(Ala)(4)(H2O)(8)] (ClO4)(6) (Ala = alanine) were synthesized, and a calorimetric study and thermal analysis for the two complexes were performed through adiabatic calorimetry and thermogravimetry. The low-temperature heat capacities of [HO2(Ala)(4)(H2O)(8)] Cl-6 and [ErY(Ala)(4)(H2O)(8)] (ClO4)(6) were measured with an automated adiabatic precision calorimeter over the temperature range from 78 to 377 K. Solid-solid phase transitions were found between 214 K and 255 K with a peak temperature of 235.09 K for [HO2(Ala)(4)(H2O)(8)] Cl-6, between 99 K and 121 K with a peak temperature of 115. 78 K for [ErY (Ala)(4) (H2O)(8)] (ClO4)(6). The enthalpies and entropies of the phase transitions were determined to be 3.02 kJ . mol(-1), 12.83 J . K-1 . mol(-1) for [HO2(Ala)(4)(H2O)(8)] Cl-6; 1.96 kJ . mol(-1), 16.90 J . K-1 . mol(-1) for [ErY(Ala)(4)(H2O)(8)] (ClO4)(6), respectively. Thermal decomposition of the two complexes were investigated in the temperature range of 40 similar to 800 degreesC by using the thermogravimetric and differential thermogravimetric (TG/DTG) analysis techniques. The TG/DTG curves showed that the decomposition started from 80 degreesC and ended at 479 degreesC, completed in two steps for [HO2 (Ala)(4) (H2O)(8)]Cl-6, and started from 120 degreesC and ended at 430 degreesC, completed in three steps for [ErY(Ala)(4) (H2O)(8)] (ClO4)(6), respectively. The possible mechanisms of the thermal decompositions were elucidated.
WOS IDWOS:000176546800001
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
2.Changde Normal Coll, Dept Chem, Changde 415000, Peoples R China
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Liu, BP,Tan, ZC,Nan, ZD,et al. Calorimetric study and thermal analysis of [Ho-2(Ala)(4)(H2O)(8)]Cl-6 and [ErY(Ala)(4)(H2O)(8)] (ClO4)(6)[J]. ACTA PHYSICO-CHIMICA SINICA,2002,18(6):481-485.
APA Liu, BP,Tan, ZC,Nan, ZD,Liu, P,Sun, LX,&Xu, F.(2002).Calorimetric study and thermal analysis of [Ho-2(Ala)(4)(H2O)(8)]Cl-6 and [ErY(Ala)(4)(H2O)(8)] (ClO4)(6).ACTA PHYSICO-CHIMICA SINICA,18(6),481-485.
MLA Liu, BP,et al."Calorimetric study and thermal analysis of [Ho-2(Ala)(4)(H2O)(8)]Cl-6 and [ErY(Ala)(4)(H2O)(8)] (ClO4)(6)".ACTA PHYSICO-CHIMICA SINICA 18.6(2002):481-485.
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