To investigate the molecular origin of this mechanics, we conducted a direct comparison between the mechanical model and the zeolite TO2 model of gis-ZIF-1. Based on the asymmetric unit TO2, the unit cell of gis-ZIF-1 includes four symmetrically distinct TO lengths (Table ). These values remained nearly constant, regardless of temperature. Within the unit cell, two TOT angles, also referred to as bridging angles, were distinctive, each of them associated with the symmetry of O sites. Each TOT angle corresponds to specific mechanical components, 4MR and helical chain, respectively. TOT angles were changed by less than 1º within the 4MR components but changed by 2.9º within helical chains as the temperature increased (Table ).