Search

Your search keyword '"Meng, Qing-Jin"' showing total 340 results
Start Over Author "Meng, Qing-Jin"
340 results on '"Meng, Qing-Jin"'

55. Synthesis and structural characterization of a novel mixed-valent Cu(II)Cu(I)Cu(II) triangular metallomacrocycle using an imine-based rigid ligand

Author

Guo Dong, Pang Ke-liang, Qian Chun-qi, Duan Chun-ying, and Meng Qing-jin

Subjects
Ligand, Stereochemistry, Imine, Tetrahedral molecular geometry, chemistry.chemical_element, Trimer, Crystal structure, Copper, Inorganic Chemistry, Crystallography, chemistry.chemical_compound, chemistry, Intramolecular force, Molecule, Physical and Theoretical Chemistry
Abstract

A novel neutral mixed-valent Cu(I)Cu(II)(2) triangular metallomacrocycle [Cu(3)L(2)(HL)].3CH(3)OH.2H(2)O (1) was assembled by reaction of the tetradentate ligand bis(N-salicylidene-4,4'-diphenylamine), H(2)L, with a copper(II) salt. ESI-MS show peaks only corresponding to the triangular structural species, indicating the high stability of the trimer structure in solution. Magnetic study confirms that there are two Cu(II) ions and one Cu(I) ion in a discrete triangular molecule. The crystal structure of 1 reveals that the triangle is formed by three deprotonated ligands and three copper ions with a Cu-Cu separation of ca. 11.8 A. Each copper atom is coordinated by two oxygen atoms and two nitrogen atoms from two different bis-bidentate ligands in a heavily distorted tetrahedral geometry, while each ligand is bound to two metal ions in a bis-bidentate coordination mode and links the metal centers overlapping in an unprogressive manner. Strong intramolecular pi.pi interactions between the ligands are found to stabilize the constraint conformation of the triangle. Electrochemical study reveals that the mixed-valent Cu(I)Cu(II)(2) complex is the most stable state in solution condition, and the electrochemical communication between the copper ions might be explained on the basis of the through-bond interaction. UV-vis-NIR spectral measurement demonstrates the Robin-Day class II behavior of the mixed-valence compound with a weak copper-copper interaction.

Published
2003

56. Design and crystal structures of triple helicates with crystallographic idealized D3 symmetry: the role of side chain effect on crystal packing

Author

Guo Dong, Meng Qing-jin, Pang Ke-liang, Duan Chun-ying, and He Cheng

Subjects
Inorganic Chemistry, Crystal, chemistry.chemical_compound, Crystallography, Chemistry, Helix, Intermolecular force, Side chain, Crystal structure, Physical and Theoretical Chemistry, Symmetry (geometry), Coordination geometry, Methyl group
Abstract

Novel crystallographic D3-symmetric binuclear triple molecular helices [Co2L(1)3][BF4]4 (1), [Zn2L(1)3][BF4]4 (2), [Mn2L(1)3][BF4]4 (3), [Co2L(2)3][BF4]4 (4), [Zn2L(2)3][BF4]4 (5), and [Mn2L(2)3][BF4]4 (6) have been achieved to establish the side chain effect on molecular packing, where L1 is [(C5H4N)C(CH3)=N-(C6H4)-]2CH2 and L2 is [(C5H4N)C(CH3)=N-(C6H4)-]2O, respectively. Crystal structure analyses show that each helix crystallizes in a hexagonal crystal system with space group Pc1 and the general axis of the helix occupies the crystallographic 3-fold axial position with the other three crystallographic 2-fold symmetries perpendicular to it. Each metal center is bound to three pyridylimine units to attain C3 pseudooctahedral coordination geometry with respective equivalent metal-N (CH=N) and metal-N (pyridyl) bonds. It is speculated that the existence of the methyl group might minimize the potential intermolecular interactions, which would be the essential factor controlling the helices formed in idealized crystallographic D3 symmetry. Moreover, crystallographic idealized C3-symmetric helicates [Co2L(3)3][BF4]4 (7), [Zn2L(3)3][BF4]4 (8), [Ni2L(3)3][BF4]4 (9), and [Cu2L(3)3][BF4]4 (10) were also structurally characterized for comparison, where L3 is [(C5H4N)C(CH3)=N-]2. All the results indicate that the existence of the methyl group in the side chain of aromatic ligands could effectively reduce the potential - intermolecular interactions and the side chain effect of the methyl group in crystal packing is robust enough to be exchanged from one network structure to another, which ensures the generality and predictability of the crystallographic idealized symmetry formation to a certain extent.

Published
2002

57. Novel ferrocene-containing helical triangular macrocycle achieved via an exchange reaction

Author

Pang Ke-liang, Guo Dong, Han Gang, Meng Qing-jin, and Duan Chun-ying

Subjects
chemistry.chemical_classification, Stereochemistry, Chemistry, Metals and Alloys, Hydrazone, General Chemistry, Catalysis, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Ion, chemistry.chemical_compound, Ferrocene, Polymer chemistry, Materials Chemistry, Ceramics and Composites
Abstract

A novel ferrocene-containing helical triangular macrocyclic compound has been constructed through an exchange reaction of hydrazone groups which templated and catalyzed by Co(II) ions.

Published
2002

66. Novel ferrocene-based mixed-metal coordination polymers

Author

Guo Dong, Mo Hong, Duan Chun-ying, Lu Feng, and Meng Qing-jin

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, chemistry, Mixed metal, Ferrocene, Coordination polymer, Polymer chemistry, General Chemistry, Polymer
Abstract

A novel 2D ferrocene-containing sandwich sheet coordination polymer, consisting of NaZnO inorganic inner and ferrocene-packing outer layers, has been achieved by simply diffusing a solution of Zn(BF4)2 into a solution of 1,1′-ferrocenedicarboxylic acid in the presence of NaOH.

Published
2002

67. Novel three-dimensional framework based on Ba9cores involving unprecedented μ5-η3:η3-acetate anions

Author

Zhang Bing-guang, Guo Dong, Pang Ke-liang, Meng Qing-jin, and Duan Chun-ying

Subjects
Perchlorate, chemistry.chemical_compound, Crystallography, Bridging (networking), chemistry, Inorganic chemistry, General Chemistry
Abstract

A three-dimensional framework based on a body-centered Ba9 cluster has been assembled, in which the bridging acetate anions show novel μ5-η3:η3-, μ4-η2:η2- and μ3-η2:η2-bridging coordination modes, while the perchlorate anions display an unusual μ4-η1:η1:η2-coordination mode.

Published
2002

80. Novel highly symmetrical cube-shaped cation with 16-nitrogen donors

Author

Yan Chunhua, Meng Qing-jin, Mo Hong, He Cheng, Zhang Bing-guang, Duan Chun-ying, and Wang Zhe-ming

Subjects
Inorganic chemistry, Metals and Alloys, chemistry.chemical_element, General Chemistry, Nitrogen, Catalysis, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Crystallography, chemistry, Materials Chemistry, Ceramics and Composites, Molecule, Cube
Abstract

A novel highly symmetrical cube-shaped trication [C36H75N16]3+ with 16-nitrogen donors is achieved via self-assembly in which two water molecules were clathrated within the cavity of the framework.

Published
2001

81. Self-assembly of a chloro-bridged helical coordination polymer achieved from a ferrocenyl-containing double-helicate

Author

He Cheng, Yan Chunhua, Fang Chen-jie, Duan Chun-ying, Wang Zhe-ming, Guo Dong, and Meng Qing-jin

Subjects
Materials science, Coordination polymer, Metals and Alloys, General Chemistry, Catalysis, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry.chemical_compound, Crystallography, chemistry, Chain (algebraic topology), Materials Chemistry, Ceramics and Composites, Self-assembly
Abstract

A new chloro-bridged single-helical chain has been constructed from a ferrocenyl-containing tetranuclear double-helical architecture via self-assembly

Published
2001

87. A double-helix generated from a ferrocenyl-thiosemicarbazato metallo-synthon and its novel hydrogen-bonding cavities

Author

Duan Chun-ying, Fang Chen-jie, Meng Qing-jin, and He Cheng

Subjects
Chemistry, Hydrogen bond, Synthon, Metals and Alloys, Supramolecular chemistry, General Chemistry, Ligand (biochemistry), Catalysis, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Crystallography, Helix, Materials Chemistry, Ceramics and Composites
Abstract

A double helical architecture generated from a readily prepared ferrocenyl-containing bisthiosemicarbazone ligand is described together with its application to the self-assembly of novel supramolecular hydrogen-bonding cavities.

Published
2000

Catalog

Books, media, physical & digital resources
See catalog results