Standard enthalpies of formation and thermodynamic cycle values of crystal lattice energies of methylammonium halides

1976 ◽  
pp. 890 ◽  
Author(s):  
John W. Wilson
Keyword(s):  
Crystal Lattice ◽  
Thermodynamic Cycle ◽  
Enthalpies Of Formation ◽  
Standard Enthalpies Of Formation ◽  
Lattice Energies

The nature of bonding in hexahalothorates and hexahalouranates(IV)

1983 ◽  
Vol 61 (7) ◽  
pp. 1573-1577 ◽  
Author(s):  
Alan D. Westland ◽  
M. T. H. Tarafder
Keyword(s):  
Solution Calorimetry ◽  
Enthalpies Of Formation ◽  
Bond Energies ◽  
Standard Enthalpies Of Formation ◽  
Lattice Energies ◽  
Semi Empirical

Enthalpies of reaction have been determined by solution calorimetry for the process 2AX(c) + ThX4(c) = A2ThX6(c) where A = K, Cs and X = Cl, Br. The measurements afforded the following values of standard enthalpies of formation [Formula: see text], in kJ mol−1: K2ThCl6, −2108; Cs2ThCl6, −2151; K2ThBr,−1774; Cs2ThBr6,−1826. The standard enthalpies of formation of ThCl62− (g), ThBr62− (g), UCl62− (g), and UBr62− (g) and the two-halide ion affinities of ThCl4, ThBr4, UCl4, and UBr4 were compared by assuming semi-empirical (Kapustinskii) values of the lattice energies of the complexes. Homolytic and heterolytic bond energies were also calculated.

Crystal structure and lattice energetics of 10-methylacridinium halides

2000 ◽  
Vol 53 (8) ◽  
pp. 627 ◽  
Author(s):  
Piotr Storoniak ◽  
Karol Krzyminski ◽  
Pawel Dokurno ◽  
Antoni Konitz ◽  
Jerzy Blazejowski
Keyword(s):  
Crystal Lattice ◽  
Lattice Energy ◽  
Enthalpies Of Formation ◽  
Triclinic Space Group ◽  
X Ray ◽  
Molecular Arrangement ◽  
Van Der Waals Contacts ◽  
Chloride Monohydrate ◽  
Insight Into

The crystal structures of 10-methylacridinium chloride monohydrate, bromide monohydrate and iodide were determined by X-ray analysis. The compounds crystallize in the triclinic space group, P¯1, with 2 molecules in the unit cell. The molecular arrangement in the crystals revealed that hydrogen bonds (in hydrates) and van der Waals contacts play a significant part in intermolecular interactions. To discover their nature, contributions to the crystal lattice energy arising from electrostatic (the most important since the compounds form ionic crystals), dispersive and repulsive interactions were calculated. Enthalpies of formation of the salts, their stability and susceptibility to decomposition could be predicted from a combination of crystal lattice energies with values of other thermochemical characteristics obtained theoretically or taken from the literature. The role of water in the stabilization of the crystal lattice of the hydrates is also explained. The information gathered has given an insight into the features and behaviour of compounds which can be regarded as models of a large group of aromatic quaternary nitrogen salts.

Standard enthalpies of formation of N,N´-(1,3-phenylene)bis(phthalimide) and N,N´-(1,3-phenylene)bis(phthalimide-5-carboxilic acid)

2021 ◽  
pp. 178861
Author(s):  
Karina Salas-López ◽  
Miguel A. García-Castro ◽  
Patricia Amador ◽  
Ana M. Herrera-González ◽  
Alberto Galicia-Aguilar ◽  
...  
Keyword(s):  
Enthalpies Of Formation ◽  
Standard Enthalpies Of Formation
Sign in / Sign up

Export Citation Format

Share Document