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Start Over Author "Hong, Maochun" Publisher elsevier bv
119 results on '"Hong, Maochun"'

34. Photoluminescences and 1D chain-like structures with dinuclear lanthanide(III) units featuring bipyridine-tetracarboxylate

Author

Feng Rui, Zhou Youfu, WU Ming-Yan, Hong Maochun, Chen Lian, and Jiang Feilong

Subjects
Lanthanide, Hydrogen bond, Crystal structure, Hydrothermal circulation, Inorganic Chemistry, Bipyridine, chemistry.chemical_compound, Crystallography, chemistry, Materials Chemistry, Physical and Theoretical Chemistry, Isostructural, Luminescence, Powder diffraction
Abstract

Four isostructural lanthanide(III) complexes, [Ln2(HL)2(H2O)4]n·2nH2O (H4L = 3,3′,6,6′-tetracarboxyl-2,2′-bipyridine) (Sm (1), Eu (2), Gd (3), Tb (4)), have been synthesized under the hydrothermal condition and characterized by single-crystal X-ray diffractions, powder X-ray diffractions (PXRD), thermal analyses (TGA) and elemental analyses (EA). These four complexes all exhibit 1D chain-like structures containing di-nuclear lanthanide(III) units, which are further linked by hydrogen bonding into 3D supramolecules. To further investigate the properties of the above complexes, the photoluminescent properties of 2 and 4 are also discussed.

Published
2012

35. Synthesis of nanosized perovskite (Ba,Sr)TiO3 powder via a PVA modified sol-precipitation process

Author

Cao Yongge, Jiang Feilong, Huang Jiquan, and Hong Maochun

Subjects
Materials science, Scanning electron microscope, Precipitation (chemistry), Mechanical Engineering, Nanoparticle, Condensed Matter Physics, Polyvinyl alcohol, Nanocrystalline material, law.invention, chemistry.chemical_compound, chemistry, Chemical engineering, Mechanics of Materials, law, Particle, General Materials Science, Calcination, Composite material, Perovskite (structure)
Abstract

Ba 0.55 Sr 0.45 TiO 3 (BST) precursors were synthesized via a polyvinyl alcohol (PVA) modified sol-precipitation route. And the obtained precursors were then calcined in air at temperatures ranging from 400 to 800 °C. The formation mechanism of BST phase was investigated using X-ray diffraction (XRD), while the effect of PVA on the particle morphology of the BST phase was studied by using scanning electron microscopy (SEM). The results show that the introduction of PVA significantly affects the morphology of the BST powders. High purity nanocrystalline powders were synthesized by calcination of the BST precursors encapsulated by PVA gel, with narrow particle distribution (30–80 nm) and being nearly free of agglomeration. While, large particles (40–170 nm) with evident agglomeration were obtained from the solution without PVA.

Published
2008

40. Heteronuclear W(Mo)CuS complexes of dialkyldithiocarbamate. Syntheses of (Et4N)2[MCu3S4(dtcR2)3] and structures of (Et4N)2[MCu3S4(dtcC5H10)3]· DMF (M = W or Mo)

Author

Liu Qiutian, Liu Hanqin, Liu Jiangnan, Kang Beisheng, Huang Zhiying, Lei Xinjian, and Hong Maochun

Subjects
Chemistry, Stereochemistry, Ligand, Infrared spectroscopy, Tetrahedral molecular geometry, Crystal structure, Triclinic crystal system, Inorganic Chemistry, Crystallography, Heteronuclear molecule, X-ray crystallography, Materials Chemistry, Molecule, Physical and Theoretical Chemistry
Abstract

Compounds (Et4N)2[MCu3S4(dtcR2)3] (M=W (1) or Mo (2); R2  C5H10 (a), Et2 (b) or C4H8 (c) were synthesized by the reaction of (Et4N)2MS4 and CuCl in the presence of NadtcR2 in DMF. The crystal and molecular structures of 1a·DMF and 2a·DMF were determined from X-ray diffraction data. The compounds are isomorphous and crystallize in the triclinic space group P 1 with unit cell parameters for 1a(2a)·DMF: a=12.047(0) (12.053(2)), b= 17.620(3) (17.650(5)), c=14.514(1) (14.533(4)) A; α=100.83(9) (100.43(3)), β=115.41(3) (115.47(2)), γ=79.49(8) (79.78(2))°; V=2715.9 (2727.8) A3, Z=2 (2), and Dx=1.611 (1.497) g/cm3. The final R values converged to 0.048 and 0.067 for M=W and Mo respectively. [p ]The four metal atoms MCu3 are coplanar with the central tetrahedron of MS4 preserved. Each Cu(I) ion is coordinated to two inorganic S atoms from MS4 and two organic S atoms from one dtcC5H10 ligand in a distorted tetrahedral geometry. Infrared spectra showed two stretching vibrations at 430–442 cm− for μ3-SM and 455–463 cm−1 for μ2-SM. The compounds are diamagnetic and show reversible one-electron oxidation-reduction at E1/2 = 0.55 V (2a).

Published
1990

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