232 research outputs found
{6-[2,5-Bis(chloromethyl)-3,4-dihydroxytetrahydrofuran-2-yloxy]-3-chloro-4,5-dihydroxy-3,4,5,6-tetrahydro-2H-pyran-2-yl}methyl acetate dihydrate
The title compound, C14H21Cl3O9·2H2O, is a disaccharide constructed from a galactose and a fructose. In the molecular structure, the tetrahydrofuran five-membered ring and tetrahydropyran six-membered ring assume envelope and chair conformations, respectively. An extensive O—H⋯O hydrogen-bonding network occurs in the crystal structure
3-Methoxy-4-methyl-1H-1,2,4-triazol-5(4H)-one monohydrate
In the title hydrate, C4H7N3O2·H2O, all the non-H atoms lie on a crystallographic mirror plane. The H atoms of both methyl groups are disordered over two sets of sites. In the crystal, N—H⋯Ow and Ow—H⋯Ok (w = water and k = ketone) hydrogen bonds link the components into (010) sheets
2,2′-(Piperazine-1,4-diyl)diacetonitrile
The complete molecule of the title compound, C8H12N4, is generated by a crystallographic inversion centre. The piperazine ring adopts a chair conformation with the N-bonded substituents in equatorial positions. In the crystal, molecules are linked by C—H⋯Nc (c = cyanide) hydrogen bonds
Methyl 2-(4-chloro-3,5-dinitrobenzamido)acetate
The title molecule, C10H8ClN3O7, is twisted with the dihedral angle between the amide and benzene ring being 38.75 (11)°. The C—N—C—C torsion angle between the amide and acetyl groups is −150.1 (2)°. Finally, each nitro group is twisted out of the plane of the benzene ring to which it is connected [O—N—C—C torsion angles = 34.0 (3) and −64.5 (3)°]. Linear supramolecular chains along [010] and mediated by N—H⋯O hydrogen bonds between successive amide groups dominate the crystal packing. The chains are consolidated into the three-dimensional structure by C—H⋯O contacts
Online social networking addiction and depression: The results from a large-scale prospective cohort study in Chinese adolescents
Background and aims The aim of this study is to estimate the longitudinal associations between online social networking addiction (OSNA) and depression, whether OSNA predicts development of depression, and reversely, whether depression predicts development of OSNA. Methods A total of 5,365 students from nine secondary schools in Guangzhou, Southern China were surveyed at baseline in March 2014, and followed up 9 months later. Level of OSNA and depression were measured using the validated OSNA scale and CES-D, respectively. Multilevel logistic regression models were applied to estimate the longitudinal associations between OSNA and depression. Results Adolescents who were depressed but free of OSNA at baseline had 1.48 times more likely to develop OSNA at follow-up compared with those non-depressed at baseline [adjusted OR (AOR): 1.48, 95% confidence interval (CI): 1.14–1.93]. In addition, compared with those who were not depressed during the follow-up period, adolescents who were persistently depressed or emerging depressed during the follow-up period had increased risk of developing OSNA at follow-up (AOR: 3.45, 95% CI: 2.51–4.75 for persistent depression; AOR: 4.47, 95% CI: 3.33–5.99 for emerging depression). Reversely, among those without depression at baseline, adolescents who were classified as persistent OSNA or emerging OSNA had higher risk of developing depression compared with those who were no OSNA (AOR: 1.65, 95% CI: 1.01–2.69 for persistent OSNA; AOR: 4.29; 95% CI: 3.17–5.81 for emerging OSNA). Conclusion The findings indicate a bidirectional association between OSNA and depression, meaning that addictive online social networking use is accompanied by increased level of depressive symptoms
Structural Design of Conjugated Poly (ferrocene‐phenanthroline) for Photocatalytic Hydrogen Evolution from Water
Heteroleptic copper(I) photosensitizers with carbazole-substituted phenanthroline ligands:Synthesis, photophysical properties and application to photocatalytic H<sub>2</sub> generation
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