Thermodynamic Properties of a First-Generation Carbosilane Dendrimer with Terminal Phenylethyl Groups

Thermodynamic Properties of the First-Generation Hybrid Dendrimer with “Carbosilane Core/Phenylene Shell” Structure

“…In our case, the value of = 334 J·K −1 ·mol −1 for hybrid dendrimer G1{Si} 13 [Ar] 32 may indicate a disordered structure of the dendritic macromolecule. The intermediate values were revealed in case of carbosilane dendrimers G1{Si} 13 [(C 6 H 4 )C 3 H 5 O 2 ] 8 [ 37 ] and G1{Si} 13 [CH 2 CH 2 C 6 H 5 ] 8 [ 38 ] containing the cyclic phenyl and heterocyclic dioxolane units on the surface layer. The previously studied pyridylphenylene dendrimer G1[C 5 H 4 N] 12 [ 43 ] had exactly the same value as the investigated hybrid dendrimer G1{Si} 13 [Ar] 32 .…”

“…Entropy 2021, 23, x FOR PEER REVIEW 8 of 13 ilane dendrimers G1{Si}13[(C6H4)C3H5O2]8 [37] and G1{Si}13[CH2CH2C6H5]8 [38] containing the cyclic phenyl and heterocyclic dioxolane units on the surface layer. The previously studied pyridylphenylene dendrimer G1[C5H4N]12 [43] had exactly the same o g T value as the investigated hybrid dendrimer G1{Si}13[Ar]32.…”

“…The arrangement of the dendritic blocks in a different manner (i.e., a flexible core and a rigid shell or vice versa) allows for a controllable synthesis of principally new dendrimers with the desired characteristics [ 35 ]. The results of our calorimetric investigations of the widespread families such as carbosilane [ 36 , 37 , 38 ], siloxane [ 39 , 40 , 41 ], and polyphenylene [ 42 , 43 ] dendrimers with different molecular structure of the inner sphere and the surface functional groups were published earlier.…”

“…As a continuation of publications on thermodynamics of dendrimers, the present study is dedicated to the calorimetric determination of the molar heat capacity of the first-generation hybrid dendrimer with a “carbosilane core/phenylene shell” structure, as well as the calculation of the standard thermodynamic functions (Δ H °, Δ S °, and Δ G °) in the range of T = 6–600 K and the estimation of the standard entropy of its formation at T = 298.15 K from the obtained experimental data. A comparative analysis of thermodynamic properties of the investigated hybrid dendrimer with the literature data for the previously studied organosilicon (carbosilane [ 36 , 37 , 38 ] and siloxane [ 39 ]) and pyridylphenylene dendrimers [ 42 , 43 ] of the first generation was performed to develop the fundamental principles of the regulation of different properties of dendrimers by varying their molecular parameters.…”