| 1. |
- Tian, Yupeng, et al.
(författare)
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Two novel two-photon polymerization initiators with extensive application prospects
- 2004
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Ingår i: Chemical Physics Letters. - : Elsevier. - 0009-2614 .- 1873-4448. ; 388:4-6, s. 325-329
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Tidskriftsartikel (refereegranskat)abstract
- Two novel two-photon polymerization initiators, 10-ethyl-3-E-(4-(N,N′-di-n-butylamino)styryl)phenothiazine 5 and 10-ethyl-3,7-E,E-bis(4-(N,N′-di-n-butyl amino)styryl)phenothiazine 6, have been efficiently synthesized with room temperature solid phase Wittig reaction. Two initiators were found to exhibit good single-photon fluorescence emission and their quantum yields, lifetimes and solvent effects have been studied in detail. Two-photon fluorescence spectra were investigated under 800 nm fs laser pulse and two-photon absorption (TPA) cross-sections of the initiators have been evaluated by theoretical calculation.Two-photon initiating polymerization microfabrication experiments have been carried out and artificial defects were made and polymerization mechanism was also discussed.
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| 2. |
- Zhang, Mingliang, et al.
(författare)
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Synthesis, crystal structure and two-photon property studies on a series of complexes derived from a novel Schiff base ligand
- 2004
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Ingår i: Transition metal chemistry (Weinheim). - : Kluwer Academic Publishers. - 0340-4285 .- 1572-901X. ; 29:6, s. 596-602
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Tidskriftsartikel (refereegranskat)abstract
- A new Schiff base ligand derived from S-benzyldithiocarbazate and 4-[N-hydroxy ethyl-N-(methyl)amino]benzaldehyde (HL, where H is a dissociable proton) and its NiII, CuII, ZnII and PdII complexes were prepared and fully characterized. The structures of HL and Ni(L)2 were determined by X-ray diffraction analysis, which revealed that the geometry of the NiII ion is square-planar with two equivalent Ni=N and Ni=S bonds, and that the two neighboring molecules in two layers have weak contact. The electronic spectra and solution fluorescence of the ligand and the complexes were studied, and the quantum yields of single-photon fluorescence for the compounds were determined. The compounds possess two-photon absorption (t.p.a.) character and the t.p.a. coefficient β and t.p.a. cross-section σ were determined by the Z-scan technique. Especially, the Zn(L)2complex and the HL ligand exhibit intensive two-photon fluorescence (t.p.f.) at 800 nm laser pulses in the femtosecond regime.
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| 3. |
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| 4. |
- Zhang, Xuanjun, et al.
(författare)
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Two strong emitting coordination polymers with chain and ladder structures
- 2003
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Ingår i: Transition metal chemistry (Weinheim). - Netherlands : Kluwer Academic Publishers. - 0340-4285 .- 1572-901X. ; 28:6, s. 707-711
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Tidskriftsartikel (refereegranskat)abstract
- Two coordination polymers [Zn(Cabo)2(EtOH)2(4,4′-Bipy)]n(1), and [Zn2(Cabo)2(NO3)2(4,4′-Bipy)2]n(2) (Cabo = carbazolylacetate, 4,4′-Bipy = 4,4′-bipyridine) with chain and ladder structures, respectively, were prepared and characterized by X-ray single-crystal structural analysis. The results showed that the different anions of metal salts have a large effect on the construction of coordination frameworks. Both complexes show strong emissions in the solid state as well as high thermal stability.
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| 5. |
- Hu, Hanmei, et al.
(författare)
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Solvothermal synthesis of Sb2S3 nanowires on a large scale
- 2003
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Ingår i: Journal of Crystal Growth. - : Elsevier. - 0022-0248 .- 1873-5002. ; 258:1-2, s. 106-112
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Tidskriftsartikel (refereegranskat)abstract
- Sb2S3 nanowires with high aspect ratios have been successfully prepared on a large scale using SbCl3 and Na2S as starting materials in ethylene glycol at 200°C for 10 h. Field emission scanning electron microscopy images and transmission electron microscopy images show that the nanowires have diameters in the range of 20–100 nm and lengths up to 50 μm. Diffuse reflection spectrum indicates that the as-prepared Sb2S3 nanowires have obvious quantum size effects. The effects of reaction parameters on the growth of nanowires were discussed. A possible mechanism on the formation of the Sb2S3 nanowires was proposed.
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| 6. |
- Li, Shengli, et al.
(författare)
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Formation of a Novel Polymeric Cadmium(II) Complex Bridged by Sulfur and Thiocyanato Ions
- 2003
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Ingår i: Chemistry Letters. - : Chemical Society of Japan. - 0366-7022 .- 1348-0715. ; 32:8, s. 748-749
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Tidskriftsartikel (refereegranskat)abstract
- The title complex, {[N(CH3)4]2[Cd(SCN)2S]}n, was prepared by self-assembling from the reaction of a methanol/water (volume ratio, 1/1) solution containing cadmium(II) thiocyanate with equivalent amount of tetramethylammonium thiocyanate. The result of single X-ray determination for the complex reveals that a novel polymeric cadmium(II) complex bridged by sulfur and thiocyanato ions was obtained, which formed a two-dimensional (2D) structure.
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| 7. |
- Raj, S. Shanmuga Sundara, et al.
(författare)
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4-(N-Hydroxyethyl -N-methylamino)-benzaldehyde thiosemicarbazone
- 2000
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Ingår i: Acta Crystallographica Section C. - 0108-2701 .- 1600-5759. ; c56, s. 1238-1239
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Tidskriftsartikel (refereegranskat)abstract
- In the crystal structure of the title compound, C11H16N4OS, the phenyl ring and the thiosemicarbazone moiety from a dihedral angle of 7.7 (1)°. The crystal structure is governed by N-H...O and O-H...S hydrogen bonds leading to the formation of a two-dimensional network.
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| 8. |
- Tian, Yupeng, et al.
(författare)
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Structural diversity and properties of a series of dinuclear and mononuclear copper(II) and copper(I) carboxylato complexes
- 2002
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Ingår i: New Journal of Chemistry. - : RSC Publishing. - 1144-0546 .- 1369-9261. ; 26:10, s. 1468-1473
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Tidskriftsartikel (refereegranskat)abstract
- The syntheses, crystal structures, magnetic and photoluminescence properties of a series of dinuclear and mononuclear copper(II) and copper(I)N-carbazolylacetate [N-carbazolylacetic acid=Hcabo] with different carboxylato coordination modes are reported. Although the carboxylato group has different coordination modes, the same carboxylate ligand binding to copper ion via four coordinating modes is rare. The crystal structure of complex [Cu2(Cabo)4(dmf)2]·2dmf (1) consists of a symmetrical dimeric Cu(II) carboxylato paddle-wheel core and oxygen atoms from dmf at the apical positions. The dinuclear complex [Cu2(Cabo)3(phen)2]ClO4·H2O·C2H5OH (2) (phen=1,10-phenanthroline) consists of an unusual dimeric core with two copper atoms bridged by three carboxylates one of which is in the η∶η∶μ2 bridging mode and the other two are in the rarer monoatomic bridging mode. To our knowledge, the present bridging mode has not been reported hitherto. Magnetic susceptibilities were measured in the temperature range 2–300 K. It is found that paddle-wheel copper(II) ions in 1 are strongly coupled antiferromagnetically with 2J=−356.4(6) cm−1, whereas complex 2 shows weak antiferromagnetic interaction with a 2J value of −12.8(4) cm−1. Copper(I)N-carbazolylacetate with strong fluorescence in the solid state as well as high thermal stability was obtained by reduction of the copper(II)N-carbazolylacetate using PPh3(triphenylphosphine) in dmf solution.
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