Activation and de-activation of fluorine synthons by nitrogen substitution in fluorinated aza-distyrylbenzenes

Supramolecular synthons in fluorinated and nitrogen-rich ortho-diaminotriazoles

“…For the X-ray analysis, we have focused on perfluorinated triazoles 2, 4, 8 in view of the abiding interest of structural chemists for weak interactions involving organic fluorine [13][14][15][16][17][18][19], and on the nitrogen-rich bis-triazole 5.…”

Quantum chemical study of self-doping PPV oligomers: spin distribution of the radical forms

“…Due to the presence of the two nitrogen atoms next to the central ring, this ring is twisted out of the plane of the peripheral rings and the CH=N spacers by about 40° [14,15]. Consequently, the SO 3 group of the sidechain is able to contact two of the ortho-methoxy groups on the peripheral rings and forms the stabilized structure presented in Fig.…”

“…The benzylidene-aniline (BA) condensation, used to prepare DSBs in which the spacers are CH=N rather than CH=CH [14,15], is one such procedure and oligomers such as 5 and 6 ( Fig. 2) would become available.…”

Fluorine–fluorine type II versus πF–π stacking interactions in the supramolecular organizations of extended thiophene derivatives end capped by imino-perfluorophenyl units

“…The discovery of the benzene-perfluorobenzene co-crystallization by Patrick and Prosper [1] initiated numerous studies aiming at a better understanding of the intermolecular interactions involved between aryl and perfluoroaryl groups [2][3][4][5][6][7][8][9]. Although the various factors that determine the role of the fluorine atoms in the intermolecular interactions are not yet fully mastered, several types of interactions can be considered: (i) pÀpF interactions between aryl and perfluoroaryl units that contribute to favor the stacking of the molecules in the materials, (ii) hydrogen bonds C-FÁ Á ÁH-C that favor the lateral contacts and can also contribute to strengthen the pi-stacking, (iii) C-FÁ Á ÁpF contacts induced by the polarization of the C-F bond and by the character globally positive in the center of the aromatic C 6 F 5 ring, and (iv) FÁ Á ÁF halogen bonds [5,[9][10][11][12][13][14][15][16].…”