Enthalpic characteristics of the sublimation of linear and branched amino acids

Linear correlation relationships are suggested for estimating Δsubl H of crystalline amino acids with different spatial configurations of side chains. It is shown that, for the same number of carbon atoms, the “solidity” coefficients (K sold) are somewhat larger for crystals containing amino acids with branched side radicals than with linear ones, despite the fact that the packing density (D pack) of the latter is higher.