Hydrogen bonding assemblies in host–guest complexes with 18-crown-6

Design of zigzag-like supramolecular 1D assemblies of polyfluorinated meta-arylenediamines and 18-crown-6

“…1b): crown ether molecules are oriented under an angle to each other and amine molecules are shifted to the periphery of the rod. Such a configuration is realized in 1D assemblies of 18-crown-6 and 4-amine-1,2,5-oxadiazole-3-carbonic acid [8] or tetrafluoro-meta-phenylenediamine (CCDC 800766 [7]) [2]. In the latter case, the zigzag arrangement of the rod components is caused, most likely, by the meta-location of amino groups in an aromatic ring.…”

Crystal structure of poly[(μ3-4-amino-1,2,5-oxadiazole-3-hydroxamato)thallium(I)]

“…The oxadiazole ring C2/C3/N2/O3/N3 is almost planar with the largest deviation from the least-squares plane being 0.007 Å for C2. The C2 N2 and C3 N3 bond lengths [1.304 (14) and 1.329 (11) Å , respectively] are typical for C N double bonds in substituted oxadiazole cycles (Viterbo & Serafino, 1978), and the N2-O3 and N3-O3 bonds [1.365 (11) and 1.419 (11) Å , respectively] also fall in a range typical for 1,2,5oxadiazoles (Fonari et al, 2003;Viterbo & Serafino, 1978). The substituent amino-and hydroxamate groups in the 4-and 3-positions, respectively, of the 1,2,5-oxadiazole ring are nearly coplanar with the oxadiazole ring, with a deviation of 0.071 Å for nitrogen atom N4 of the amino group and a dihedral angle between the mean plane of the heterocycle and the hydroxamate group C1/O2/N1/O1 of 8.4 (4) .…”

“…The substituent amino-and hydroxamate groups in the 4-and 3-positions, respectively, of the 1,2,5-oxadiazole ring are nearly coplanar with the oxadiazole ring, with a deviation of 0.071 Å for nitrogen atom N4 of the amino group and a dihedral angle between the mean plane of the heterocycle and the hydroxamate group C1/O2/N1/O1 of 8.4 (4) . The C3-N4 [1.360 (13) Å ] and N1-O1 [1.412 (9) Å ] bond lengths are typical for a non-coordinating amino group (Fonari et al, 2003;Viterbo & Serafino, 1978) and for a deprotonated hydroxamate group (Golenya et al, 2012;Safyanova et al, 2017), respectively. On the other hand, the C1-N1 [1.314 12 (Larsen, 1988), accompanied by a delocalization of the electrons over the N1-C1-O2 backbone and a disorder of the corresponding hydrogen atom that could not be localized from difference-Fourier maps.…”

(E)-2-Hydroxy-3-methoxybenzaldehyde thiosemicarbazone

“…For related crystal structures, see: Joseph et al (2006). For biological activities of thiosemicarbazone Schiff bases, see: Kasuga et al (2001); Fonari et al (2003).…”