681161-17-1Relevant articles and documents
A Contrivance for a Dynamic Porous Framework: Cooperative Guest Adsorption Based on Square Grids Connected by Amide - Amide Hydrogen Bonds
Uemura, Kazuhiro,Kitagawa, Susumu,Fukui, Koichi,Saito, Kazuya
, p. 3817 - 3828 (2004)
Flexible porous coordination polymers containing amide groups as a function origin have been synthesized and categorized as Coordination Polymer with Amide Groups . Bispyridyl ligands with a spacer of amide group afford two-dimensional (2-D) motifs with a deformed square grid, resulting in three-dimensional (3-D) frameworks of [Co(NO3) 2(3-pna)2]n (1), [Co(Br) 2(3-pna)2]n (2), and {[Co(NCS) 2(4-peia)2]· 4Me2CO}n (3 ? 4Me2CO) (3-pna = N-3-pyridylnicotinamide, 4-peia = N-(2-pyridin-4-yl-ethyl)-isonicotinamide), where the 2-D motifs are bound by complementary hydrogen bond between the amide groups. In the case of the 3 ? 4Me2CO, the amide groups form a contrivance for a dynamic porous framework because of their relevant position and orientation in the mutual nearest neighboring motifs. Consequently, 3 ? 4Me2CO shows amorphous (nonporous)-to-crystal (porous) structural rearrangement in the Me2CO adsorption and desorption process, where the framework of the 2-D motif is maintained. The adsorption isotherm has threshold pressure (P th), a sort of gate pressure. The heat of Me2CO adsorption (ΔHad = -25 kJ/mol) is obtained from the temperature dependence of threshold pressure (Pth), which is close to acetone vaporization enthalpy (ΔHvap = 30.99 kJ/mol).
