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| Titel: |
CALORIMETRIC STUDY OF THERMOCHROMIC COMPLEXES. 2. HEAT CAPACITY AND PHASE TRANSITION OF BIS(N,N-DIETHYLETHYLENEDIAMINE)COPPER(II) PERCHLORATE |
| Auteur: |
Nishimori, Akihito Sorai, Michio Schmitt, Edward A. Hendrickson, David N. |
| Verschenen in: |
Journal of coordination chemistry |
| Paginering: | Jaargang 37 (1996) nr. 1-4 pagina's 327-340 |
| Jaar: |
1996-02-01 |
| Inhoud: |
The thermochromic phase transition of bis(N,N-diethylethylenediamine) copper(II) perchlorate has been studied by adiabatic calorimetry in the 12-359 K temperature range. A large heat capacity anomaly was observed at 317.64 K with a long heat-capacity tail extending down to ∼200 K. The enthalpy and entropy of the phase transition were found to be δtrsH = 17.43 kJ mol-1 and δtrsS = 55.21 J K-1 mol-1, respectively. Together with a calorimetric study of a homologous thermochromic complex, bis(N,N-diethylethylenediamine)copper(II) tetrafluoroborate (J. Phys. Chem. Solids, 55, 99 (1994)), the nature of the present thermochromic phase transition is well described by a puckering motion of the copper-ligand chelate rings and a change in the ligand-field strength estimated on the basis of the angular overlap model. The correlation between structures, electronic spectra and thermal properties is discussed. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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