“…Following our previous work, the composite method W1X-1 was used for the calculation of standard gas-phase enthalpies of formation (Δ f H 298K ° , kJ mol –1 ), entropies ( S 298K ° , J K –1 mol –1 ), and heat capacities ( C p , J K –1 mol –1 ) for 159 organosilicon compounds (Chart ), which include 42 monosilanes ( 1 – 42 , group I ), 7 polysilanes ( 43 – 49 , groups II – V ), 31 silanols and alkoxysilanes ( 50 – 80 , groups VI – IX ), 70 acylic siloxanes ( 81 – 150 , groups X – XII ), 8 cyclic siloxanes ( 151 – 158 , groups XIII and XIV ), and 1 silylamine ( 159 , group XV ) with alkyl (Me = methyl, Et = ethyl, i Pr = isopropyl, s Bu = sec -butyl, and 3-Pe = 3-pentyl), alkenyl (Vi = vinyl), aryl (Ph = phenyl), and/or fluorine substituents. The size of the investigated systems was limited by the computational cost of the W1X-1 method that became prohibitive for molecules with more than ca.…”