Reversible trans-to-cis photoisomerization and irreversible photocyclization reactions of a Co-coordinated stilbene derivative on chiral di-ß-diketonate lanthanide complexes.

Six lanthanide complexes constructed from two chiral ß-diketonates (d/l-fbc = 3-heptafluorobutyryl-(+)/(-)-camphorate), the stilbene derivative (E)-N',N'-bis(pyridin-2-ylmethyl)-4-styrylbenzoyl hydrazide (L), a trifluoroacetate anion (CF3CO2 -), and one water molecule, namely [Ln(d/l-fbc)2(L)(CF3CO2)]·H2O (LnC57H54F17N4O8, Ln = La (1, d-fbc), La (2, l-fbc), Sm (3, d-fbc), Eu (4, d-fbc), Eu (5, l-fbc), and Tb (6, d-fbc), were synthesized and characterized by single-crystal X-ray diffraction, 1H-NMR, elemental analysis, IR and UV-vis spectroscopy, and thermal gravimetric analysis. The photoisomerization reactions of these complexes were systematically studied by means of experimental and theoretical calculations. Crystals of complexes 1, 2, 3, and 4 were obtained and belong to the monoclinic crystal system and the C2 chiral space group. The Λ- and Δ-diastereomers coexist in their crystals and no apparent bisignate couplets are observed in their ECD spectra. Among the complexes, the photocyclization reaction is followed by the trans-to-cis photoisomerization reaction and competes with the trans-to-cis photoisomerization, then the photocyclization reaction continues. The photocyclization reaction is irreversible in this stilbene derivative and is delayed in the lanthanide complexes. These results provide a viable strategy for the design of promising new stilbene-attached dual-functional lanthanide-based optical-switching materials.

Ruthenium-bipyridine complexes bearing fullerene or carbon nanotubes: synthesis and impact of different carbon-based ligands on the resulting products.

This paper discusses the synthesis of two carbon-based pyridine ligands of fullerene pyrrolidine pyridine (C(60)-py) and multi-walled carbon nanotube pyrrolidine pyridine (MWCNT-py) via 1,3-dipolar cycloaddition. The two complexes, C(60)-Ru and MWCNT-Ru, were synthesized by ligand substitution in the presence of NH(4)PF(6), and Ru(II)(bpy)(2)Cl(2) was used as a reaction precursor. Both complexes were characterized by mass spectroscopy (MS), elemental analysis, nuclear magnetic resonance (NMR) spectroscopy, infrared spectroscopy (IR), ultraviolet/visible spectroscopy (UV-VIS) spectrometry, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and cyclic voltammetry (CV). The results showed that the substitution way of C(60)-py is different from that of MWCNT-py. The C(60)-py and a NH(3) replaced a Cl(-) and a bipyridine in Ru(II)(bpy)(2)Cl(2) to produce a five-coordinate complex of [Ru(bpy)(NH(3))(C(60)-py)Cl]PF(6), whereas MWCNT-py replaced a Cl(-) to generate a six-coordinate complex of [Ru(bpy)(2)(MWCNT-py)Cl]PF(6). The cyclic voltammetry study showed that the electron-withdrawing ability was different for C(60) and MWCNT. The C(60) showed a relatively stronger electron-withdrawing effect with respect to MWCNT.

3-Chloro-4-hydroxy-furan-2(5H)-one.

In the title compound, C(4)H(3)ClO(3), mol-ecules are linked via O-H⋯O hydrogen bonds into an infinite chain with graph-set motif C(6) along the c axis.

1-Phenyl-5-[4-(trifluoro-meth-yl)phen-yl]-pyrazolidin-3-one monohydrate.

In the mol-ecule of the title compound, C(16)H(13)F(3)N(2)O·H(2)O, the two benzene rings are oriented at a dihedral angle of 82.55 (3)° and the pyrazole ring adopts an envelope conformation. In the crystal structure, inter-molecular C-H⋯F hydrogen bonds link the mol-ecules into chains.

[The application of Chinese health questionnaire for mental disorder screening in community settings in mainland China].

OBJECTIVE: To examine the applicability of Chinese Health Questionnaire (Taiwan version) (CHQ) originated from General Health Questionnaire (GHQ) for mental disorder screening in community settings in mainland China. METHODS: A pilot study was conducted in Hangzhou (n = 377). Three thousand seven hundred and seven subjects were recruited from four cities to validate the results of the pilot study. Validation of the Screening Questionnaire was analyzed, using Relative Operating Characteristic (ROC) method. RESULTS: Cronbach's alpha coefficients were calculated to be 0.79 for the 12-items and 0.89 for 30-items to CHQ version in the first sample, and 0.74 in the second sample (12-items). Four factors were extracted from the CHQ-30, including somatic symptoms, anxiety and worry, social dysfunction, poor family relationship, and depression. CHQ-12 could be explained by a single factor in both samples. The areas under ROC were 0.80 (95% CI: 0.70 - 0.89) for 12 items and 0.72 (95% CI: 0.62 - 0.82) for 30 items. The sensitivities of CHQ-12 and CHQ-30 were found to be 76.9% and 71.8%, and the specificities were 73.8% and 67.9% with Kappa value 0.44 (P = 0.00) and 0.38 (P = 0.00), respectively. The estimated rates of mental disorder were 18.13% (95% CI: 14.16 - 22.10) by CHQ-12, and 22.80% (95% CI: 18.19 - 27.11) by CHQ-30 in the first sample and the rates were 21.72% (95% CI: 20.39 - 23.05) by CHQ-12 in the second sample. CONCLUSION: CHQ, especially CHQ-12 through slight language modification, could be used for epidemiological studies and on community health care to screen for mental disorder in the mainland of China.