Crystal structure and thermodynamic stability of the [Hg(Pyridine)₄(NO₃)₂] · 2(Pyridine) inclusion compound

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DOIResolve DOI: http://doi.org/10.1007/s10847-004-0913-y
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TypeArticle
Journal titleJournal of inclusion phenomena and molecular recognition in chemistry
Volume50
Issue3-4
Pages227233; # of pages: 7
SubjectCrystal structure; mercury(II) nitrate; pyridine; tensimetric method; thermodynamic stability; Werner clathrates
AbstractThe studied compound belongs to the family of [MPy₄X₂] ⋅ 2Py isomorphous clathrates. Its crystal structure exhibits a van der Waals architecture formed by neutral [HgPy₄(NO₃)₂] host molecules, with the guest pyridine molecules included in the cavities of the host lattice. The host complex is formed by coordination of four pyridines, located near the equatorial plane, and two nitrates, located axially, to the Hg(II) cation. One of nitrates ligates as a monodentate ligand and another as a bidentate. The coordination polyhedron is 'HgN₄O₃', with average Hg-NPy and Hg-Onitrate distances of 2.38(5) and 2.68(1) Å, respectively. The crystal structure is complicated with a superlattice and the crystal symmetry reduced to monoclinic, as compared to the structure usually occurring in the [MPy₄X₂] ⋅ 2Py clathrates. The pyridine vapor pressure over the clathrate was measured in the 293-369 K temperature range by the static tensimetric method. Thermodynamic parameters of the clathrate dissociation were calculated from these data. For the reaction 1/3[HgPy₄(NO₃)₂] ⋅ 2Pysolid=1/3[HgPy₃(NO₃)₂] solid + Pygas the parameters are as follows: ΔHºav = 49.4(2) kJ/mol, ΔSºav = 127(2) J/(mol K) and ΔGº₂₉₈=11.4(3) kJ/mol. The results are compared with previously reported data on compounds of the [MPy₄(NO₃)₂] ⋅ 2Py series.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12330170
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Record identifier1d036511-58e2-433e-97f6-025d7143efa1
Record created2009-09-10
Record modified2016-05-09
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