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The standard molar enthalpy of combustion (Δ c  H  o  m ) and formation (Δ f  H  o  m ) of quaternary ammonium tetrachlorozincate [ n -C n H 2n+1 N(CH 3 ) 3 ] 2 ZnCl 4  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 Δ c  H  o  m  increased and Δ f  H  o  m  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 -Δ c  H  o  m  =1440.50n +3730.67 and -Δ f  H  o  m  = −85.32n + 1688.22.

Standard molar enthalpy of combustion and formation of quaternary ammonium tetrachlorozincate [n-CnH2n+1 N(CH3)3]2 ZnCl4