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| Titel: |
CONTACT STABILIZATION OF HOST COMPLEX MOLECULES DURING CLATHRATE FORMATION: THE PYRIDINE-ZINC NITRATE AND THE PYRIDINE-CADMIUM NITRATE SYSTEMS |
| Auteur: |
Dyadin, Yu. A. Soldatov, D. V. Logvinenko, V. A. Lipkowski, J. |
| Verschenen in: |
Journal of coordination chemistry |
| Paginering: | Jaargang 37 (1996) nr. 1-4 pagina's 63-75 |
| Jaar: |
1996-02-01 |
| Inhoud: |
Clathrate formation ranges of the phase diagrams of two binary systems Py-Zn(NO3)2 and Py-Cd(NO3)2 (Py = pyridine) were studied. A clathrate of composition [MPy4(NO3)2]·2Py (M = Zn, Cd) was observed in each of the systems. The space group Ccca (orthorhombic system) and the parameters of the unit cells of both clathrates were determined by X-ray analysis of their single crystals. The data obtained show them to be isostructural with the clathrate [NiPy4(NO3)2]·2Py whose structure is known and suggest the actual presence of the host molecules trans-[MPy4(NO3)2] (M = Zn,Cd) inside the clathrate phases. Host complexes do not form as separate compounds but can only arise in clathrate phases due to contact stabilization by the guest molecules. Both Zn- and Cd-clathrates are of constant composition and melt incongruently at 62.3(6) and 106.0(5)°C, respectively, yielding the complexes [ZnPy3(NO3)2] and [CdPy3(NO3)2], these melting congruently at 131.4(5) and 169.5(5)°C, respectively. During thermal decomposition under quasi-equilibrium conditions with different pressures of the liberating pyridine both clathrates also decompose in one stage, giving [MPy3(NO3)2] complexes. The results obtained are discussed in relation to a number of other systems with Schaeffer's and Hofmann-lwamoto's clathrates in which contact stabilization occurs or might be expected to occur. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 8 van 73 gevonden artikelen
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