Abstract
The standard molar enthalpy of combustion (ΔcHom) and formation (ΔfHom) of quaternary ammonium tetrachlorozincate [n-CnH2n+1N(CH3)3]2ZnCl4 have been determined for the hydrocarbon chain length from even number 8 to 18 of carbon atoms (n) by an oxygen-bomb combustion calorimeter. The results indicated that the values of ΔcHom increased and ΔfHom decreased with increasing chain length and showed a linear dependence on the number of carbon atoms, which were caused by that the order and rigidity of the hydrocarbon chain decreased with increasing the carbon atoms. The linear regression equations are -ΔcHom =1440.50n +3730.67 and -ΔfHom = −85.32n + 1688.22.
Highlights
IntroductionThe quaternary ammonium tetrachlorometallate with the general formula [n-CnH2n+1NR3]2MX4
The quaternary ammonium tetrachlorometallate with the general formula [n-CnH2n+1NR3]2MX4 (M = Cu, Mn, Cd, Zn, Co, . . ., X = Cl, Br, I, R is alkyl, or aryl) have been attracted considerable attention because of their physical properties including ferro, piezo- or pyroelectricity, ferri, antiferro- or piezomagnetism and their technical application for electro- or magneto-optical devices (Blachnik et al 1996; Kezhong et al 2010)
For the synthesis of CnC3Zn, the hot absolute ethanol solutions of ZnCl2, concentrated HCl and the corresponding quaternary ammonium were mixed in a 1:2:2 molar ratios
Summary
The quaternary ammonium tetrachlorometallate with the general formula [n-CnH2n+1NR3]2MX4 . ., X = Cl, Br, I, R is alkyl, or aryl) (short notation: CnC3M) have been attracted considerable attention because of their physical properties including ferro-, piezo- or pyroelectricity, ferri-, antiferro- or piezomagnetism and their technical application for electro- or magneto-optical devices (Blachnik et al 1996; Kezhong et al 2010). The advances in synthesis along with the ease of controlling various structural parameters (metal, halogen and number of carbon atoms in the alkylammonium ion) have made them ideal objects for studies by spectroscopy, calorimetry, diffraction, and a variety of other techniques (Abid et al 2011; Donghua et al 2011; Shymkiv et al 2011). The thermodynamic properties of the CnC3M have been reported rarely in the literature.
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