In this paper we are observing the behavior of low-temperature heat capacity for metal beta-diketonates to detect the relation between thermodynamic and structural characteristics of these metals. As a starting point, a correlation between the heat capacity and the molecule's effective size was detected for metal tris-beta-diketonates: Al(C(5)H(7)O(2))(3), Cr(C(5)H(7)O(2))(3), Fe(C(5)H(7)O(2))(3), Ir(C(5)H(7)O(2))(3), Fe(C(11)H(19)O(2))(3), and Fe(C(5)HF(6)O(2))(3). If we consider the nature Of Such an interrelation we call see how the observed correlation is connected with the changes of intermolecular interactions in a number of compounds under Study. It is demonstrated that universal behavior of the heat capacity oil a wide range of temperatures call be observed for metal beta-diketonates with identical ligands. The explanation of the detected regularity is related to the identical Structure in a short-range ordering, which initiates the coincidence in the vibration spectrum of these objects in a high frequency range. A simple equation has been put forward For the framework of detected regularities to describe heat capacity behavior in compounds considering a wide range of temperatures. The results obtained can be used in calculating and forecasting thermodynamic characteristics of unstudied objects of metal beta-diketonate classes, for those where Structural data are known, Observing the degree of generality of the results obtained, we came to think that the regularities that we detected can be observed within other classes of molecular crystals.