A nano-MoS2/montmorillonite K-10 (K10) composite was prepared and characterized. The composite contains two types of 2H-MoS2 nanoparticles. One is the hollow spherical MoS2 with a size range of 75[Formula: see text]nm, and the other is the spherical nano cluster of MoS2 with a size range of 30[Formula: see text]nm. The two kinds of nano-MoS2 were formed via assembly of numerous MoS2 nano-platelets with a size of [Formula: see text][Formula: see text]nm. A tribological comparison was then made among nano-MoS2/K10, K10, nano-MoS2 and a mechanical mixture of K10 and nano-MoS2. K10 reduced the wear but slightly increased the friction. Nano-MoS2 remarkably reduced both friction and wear. The mechanical mixture demonstrated better wear resistance than nano-MoS2, indicating a synergistic anti-wear effect of nano-MoS2 and K10. The synergistic effect was reinforced using nano-MoS2/K10 instead of the mechanical mixture. A part of the MoS2 in the contact region always lubricated the friction pair, and the rest formed a tribofilm. K10 segregated the friction pair to alleviate the ablation wear but magnified the abrasive wear. S-MoS2 protects K10 and they together function as both a lubricant and an isolating agent to reduce the ablation and abrasive wear.

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Two triphenylamine-based derivatives that can be used as two-photon absorption chromophore, tris{4-[4-(3-trifluoromethyl-3-oxopanoyl)]phenyl}amine (1) and tris{4-[4-(3-phenyl-3-oxopanoyl)] phenyl} amine (2) were successfully synthesized and fully characterized by elemental analysis, IR, 1 H NMR and MS. The single crystal X-ray diffraction analysis showed that the molecules possess D-(π-A) 3 structures. One-and two-photon absorption and fluorescence in various solvents were experimentally investigated.A data recording experiment proved the potential application of these chromophores.two-photon absorption, triphenylamine derivative, chromophore, crystal structure

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The molecule of the title compound, C25H21N3, contains three aromatic components and displays a non-planar structure. The dihedral angles between the imidazole and benzene planes and between the benzene and carbazole planes are 19.9 (2) and 24.8 (1)°, respectively.

Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.003 Å; R factor = 0.041; wR factor = 0.109; data-to-parameter ratio = 20.3.The molecule of the title compound, C 16 H 22 N 4 S 2 , has a center of symmetry. The crystal packing is mainly stabilized by van der Waals forces. Related literatureFor related literature, see: Allen et al. (1987); Bu et al. (2002); Raper (1997).Experimental Crystal data C 16 H 22 N 4 S 2 M r = 334.50 Monoclinic, P2 1 =c a = 5.3851 (2) Å b = 12.6233 (6) Å c = 13.3282 (6) Å = 97.048 (3) V = 899.17 (7) Å 3 Z = 2 Mo K radiation = 0.30 mm À1 T = 296 (2) K 0.24 Â 0.17 Â 0.08 mm Data collection Bruker APEXII CCD area-detector diffractometer Absorption correction: multi-scan (APEX2; Bruker, 2005) T min = 0.93, T max = 0.98 4768 measured reflections 2067 independent reflections 1398 reflections with I > 2(I) R int = 0.022 Refinement R[F 2 > 2(F 2 )] = 0.041 wR(F 2 ) = 0.109 S = 1.03 2067 reflections102 parameters H-atom parameters constrained Á max = 0.17 e Å À3 Á min = À0.16 e Å À3

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The title compound, C35H30N2S3, has been synthesized by a solvent-free reaction. The mol­ecule exhibits an E,E configuration, the benzene rings and pyrimidine rings being located on the opposite sides of the C=C bonds. The centroid–centroid separation of 3.5808 (17) Å indicates the existence of π–π stacking between nearly parallel pyrimidine and benzene rings of adjacent mol­ecules.