A cooperation molecular recognition study: syntheses and analysis of supramolecular assemblies of tetrafluoroterephthalic acid with some aza compounds

The hydrogen bond between N—H or O—H and organic fluorine: favourable yes, competitive no

“…One is WITHAI, which is discussed later (x3.6). Another is GILZOS (Greb et al, 2013), where one N + -H hydrogen-bonds to an O atom and the other forms a bifurcated hydrogen bond to O and F. The remaining two, REXNUF and YOCZOH (Wang et al, 2013(Wang et al, , 2014, have questionable features in their packing. 9 In conclusion, the overwhelming majority of N + -HÁ Á ÁF-C interactions are either incidental (minor components of bifurcated bonds) or are in structures so deficient in standard acceptors or high in fluorine proportion as to preclude any other sort of hydrogen bond.…”

Robustness of thioamide dimer synthon, carbon bonding and thioamide–thioamide stacking in ferrocene-based thiosemicarbazones

“…As function is always related to three-dimensional structure, the quest for supramolecular synthons in three-dimensional networks is one of the main aims of crystal engineers to understand and explore the principles involved in the formation of that particular structure. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The acquired knowledge can then be used for the deliberate design of novel crystalline materials with desired properties. [21][22][23][24][25][26] For this purpose, however, highly consistent synthons with sufficiently directional intermolecular forces are required.…”

Energetic multi-component molecular solids of tetrafluoroterephthalic acid with some aza compounds by strong hydrogen bonds and weak intermolecular interactions of C–H⋯F and C–H⋯O

“…5b). Adjacent 1D chains are connected by molecules of 2-MeBzlmH via N-H⋯O and C-H⋯F hydrogen bonds, thus, a 2D planar layered structure is formed, meanwhile, synthons R 2 2 (10), R 4 3 (17), and R 4 4 ( 21) result from the hydrogen bonds. Moreover, in this compound, there is another 2D layer structure; unlike the former layer, in this 2D construction, the carboxylic acids are completely protonated, and for this reason, the molecules of H 2 tfBDC cannot form one-dimensional chains, as displayed in the Fig.…”

“…15 Although, these interactions are considered weak, they play a vital role in directing molecular assembly especially when constructing there-dimensional (3D) networks. 16 Lately, we have reported an article about H 2 tfBDC with 3-hydroxypyridine, 2-aminopyrimidine, 4-dimethylaminopyridine, 4,4′-bipyridine, 2,5-bis(4-pyridyl)-1,3,4-oxadiazole, o-phenanthroline, and imidazole-eight novel compounds, 17 in order to make it more systematic, we synthesised another nine crystals in this article and the structural analysis of these crystals was obtained (Scheme 1).…”