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Featured researches published by Ls Zheng.


Chemical Physics Letters | 2000

A theoretical study for the isomers of neutral, cationic and anionic phosphorus clusters P5, P7, P9

M.D. Chen; Rb Huang; Ls Zheng; Qiugen Zhang; C.T. Au

Abstract The cations and anions of P 5 , P 7 and P 9 exhibit intensities of significance on the mass spectra of phosphorus clusters produced in direct laser vaporization. We have acquired in the total fifty isomers of P 5 , P 7 , P 9 and their cations and anions by means of the B3LYP, DFT method. According to total energies, the most stable isomers have been predicted. A cationic cluster prefers to adopt structures with an atom(s) which is four-fold coordinated. The planar pentagon structure is a frequent sub-unit in the phosphorus clusters. Both tetrahedral P 4 and cuneane P 8 are common components of the clusters and can be considered as important units for the construction of large clusters.


Journal of Molecular Structure-theochem | 2000

The prediction of isomers for phosphorus clusters P-8 and P-9(+)

M.D. Chen; Rb Huang; Ls Zheng; C.T. Au

Abstract In the study of cationic phosphorus clusters produced in direct laser vaporization, it has been realized that P 8 and P 9 + are entities to be considered in mass spectrum interpretation. We acquired 20 P 8 and 19 P 9 + isomers with molecular graphics and then carried out optimizations with molecular mechanics, PM3 semi-empirical and ADF density functional calculations. In these isomers, the phosphorus atoms adopt twofold, threefold or fourfold coordination. According to the bonding energies, the cage-shape models are more stable than the planar ones, and the models with a large planar ring are the least stable. The most stable cuneane P 8 structure with 12 single bonds was adopted as the basic unit for polymerization. By adding a phosphorus atom to the bottom right side of cuneane and assuming a positive charge for optimization, we derived P 9 + isomers and identified the one with the lowest bonding energy. We detected that the P 9 + isomers with double bonds are less stable and the distortion of P 9 + isomers with high symmetry would result in lower bonding energies.


Chemical Physics Letters | 2001

A density functional study for the isomers of anionic sulfur clusters S-n(-) (n=3-20)

M.D. Chen; Min Liu; Ls Zheng; Qiugen Zhang; C.T. Au

Abstract The signals of anionic sulfur clusters are intense in the mass spectrum of sulfur clusters generated in direct laser vaporization. We have acquired numerous isomers of sulfur clusters by means of the B3LYP DFT method. According to total energies, the most stable Sn− (n=3–13) isomers are predicted. The helical Sn (n=14–20) structures are also calculated. Most of the anionic clusters are with chain configurations; the ring clusters with threefold atom(s) are higher in total energy. The most stable forms of isomers, from S9− to S13−, show helical configurations that are completely different from those of the corresponding neutral and cationic clusters.


Main Group Metal Chemistry | 2002

Crystal structure of sodium cobalt(III) 1,2,4-benzenetricarboxylate

Y. P. Ren; 任艳平; L. S. Long; 龙腊生; Ls Zheng; 郑兰荪; Seik Weng Ng

Figure 1. 75% Probability ORTEP plot illustrating the geometry of the sodium atom in [Na][Co][C9Hi06]. Selected bond distances and angles: Nal-Ol = 2.486(3), Nal-ΟΙα = 2.328(4), Nal-036 = 2.575(3), Nal04b = 2.392(3), Nal-05c = 2.343(4), Nal-05</ = 2.381(4) Ä; Ol-Nal-Ola =145.0(2), 01-Nal-036 = 131.4(1), Ol-Na 1-046 = 85.1(1), 01-Nal-05c = 77.4(1), 01 -Na 1 -05d = 86.8(1), 01a-Nal-036 = 79.6(1), 01a-Nal-04A = 127.8(1), 01a-Nal-05c = 97.0(1), 01a-Nal-05i/ = 79.8(1), 036-Nal-04c = 85.8(1), 036-Nal-05</ = 126.7(1), 036-Nal-056 = 52.4(1), 04A-Nal-05c = 98.4(1), 046-Nal-05i/ = 110.9(1), 05c-Nal-05i/ = 145.3(2)°. Symmetry transformations used to generate equivalent atoms: a = χ 1/2, 3/2 -y, z;b = 3 / 2 x , \ / 2 +y, 1 z ; c = 3 / 2 x , 1/2 +y, -z-,d=\ -χ, 1 -y, -z.


Main Group Metal Chemistry | 2002

Crystal structure of a 3D coordination polymer: Sodium lanthanide terephthalate N, N-dimethylformamide solvate

L. S. Long; 龙腊生; J. Y. Hu; Y. P. Ren; 任艳平; Z. G. Sun; Rong-Bin Huang; 黄荣彬; Ls Zheng; 郑兰荪

Figure 1. ORTEP plot showing coordination environment of lanthanide and sodium ions at the 50% probability level. Hydrogen atoms are omitted for clarity. Selected bond distances and angles: Lai-Ol 2.5481(16), La I 0 3 2.5962(16), L a l 0 5 2.6078(18), La l -04 2.6322(17), La l -02b 2.6711(16), N a l 0 4 2.2361(15), N a l 0 2 e 2.3896(18), N a l 0 2 b 2.3896(18), Na l -05d 2.5054(17), Na l -La ld 3.6734(6) Ä, 0 1 La l -Ola 51.38(8), 0 1 L a l 0 3 77.99(6), 0 3 L a l 0 3 a 149.99(9), 0 1 L a l 0 5 127.84(6), 0 3 L a l 0 5 118.44(5), 0 5 L a l 0 5 a 147.76(9), 0 1 L a l 0 4 110.16(5), 0 3 L a l 0 4 49.65(5), 0 5 a L a l 0 4 110.90(5), 0 3 a L a l 0 4 a 49.65(5), 0 4 L a l 0 4 a 179.15(6), 0 1 L a l 0 2 b 160.70(6), 0 3 a L a l 0 2 b 122.74(6), 05 -La l 0 2 b 69.57(6), 0 1 L a l 0 2 c 134.34(6), 0 3 L a l 0 2 c 122.74(6), 0 5 a L a l 0 2 c 69.57(6), 0 4 L a l 0 2 c 113.62(5), 0 2 b L a l 0 2 c 48.57(7), 0 4 d N a l 0 5 d 77.10(6), 0 4 N a l 0 5 d 102.90(6), 0 2 e N a l 0 5 d 75.91(6)°. Symmetry transformation: a = -x+1, y, -z+3/2; b = -x+I, y-1, -z+3/2; c = x, y-I, z; d = -x+1, -v, -z+l; e = x, -y+1, z-l/2;f= -x+1, y+1, -z+3/2; g = x, y+1, z.


Main Group Metal Chemistry | 2002

Crystal structure of a 3D coordination polymer: Zinc terephthalate hydrate

Shi-Yao Yang; L. S. Long; Rb Huang; Ls Zheng; 郑兰荪

Figure 1. ORTEP plot of a portion of the ID zigzag chain formed in zinc terephthalate hydrate. The diagram was drawn at the 50% probability level and hydrogen atoms have been omitted for clarity. Selected bond distances and angles: Znl-Ol 1.9446(17), Zn l -03 1.978(3), Zn l -026 2.1829(17) Ä; O l -Zn l -O la 138.68(12), 01 -Zn l -03 110.66(6), 01-Znl -026 88.43(7), 03-Znl -02b 87.14(5), 01-Znl -02c 93.58(7), 02A-Zn 1 -02c 174.28(9)°. Symmetry transformation: a = x, y, z+5/2, b = x, -y+1, z+1/2, c = x, y+1, -z+2.


European Physical Journal D | 1995

MASS-DISTRIBUTION OF CLUSTER IONS PRODUCED FROM LASER-ABLATION OF METAL-COMPOSITE-OXIDES Y-M-CU-O (M=BA, SR, CA, MG)

Zy Liu; Cr Wang; Rb Huang; 黄荣彬; Ls Zheng; 郑兰荪

Laser ablation of YMCuO metal-composite-oxides (M=Ba, Sr, Ca, Mg) in high vacuum produced cluster ions with various sizes and compositions. Mass spectra of the cluster ions were recorded by a home-built time-of-flight (TOF) mass spectrometer and the mass distributions were analyzed by a statistical model. For YBa2Cu3O7−x (YBCO) high-Tc superconducting samples, six series of cluster ions were observed. Replacement of barium in the metal-composite-oxide sample with other alkaline earth metal, such as strontium, calcium, or magnesium, not only removed the superconductivity, but also changed the compositions and distributions of the laser generated cluster ions. For instance, copper was only found in the compositions of cluster ions generated from YBCO sample. From comparison of the experimental results, interactions among components of the metal-composite-oxides and the function of alkaline earth metal in superconducting material were discussed.


Main Group Metal Chemistry | 1999

THE PREDICTION OF ISOMERS FOR THE PHOSPHORUS CLUSTERS P7

M.D. Chen; Rb Huang; Ls Zheng; C.T. Au

In the study of cationic phosphorus cluster produced in direct laser vaporization, it has been observed P7· shows the highest intensity in the mass spectrum. We acquired twenty-four P7· isomers with molecular graphics and then carried out optimizations with molecular mechanics, PM3 semi-empirical and ADF density functional calculations. In these isomers, the phosphorus atoms could be in two-fold, three-fold, four-fold or six-fold coordination. P7 which derived from the most stable Ρβ by adding a phosphorus atom against the double bond has the lowest bonding energy. When there is a six-fold atom in the structure, the d orbital is involved in bonding. According to the bonding energies, the models with a planar ring or a six-fold atom are relatively less stable.


Acta Crystallographica Section E-structure Reports Online | 2005

Hexaaquamanganese(II) 5,5 ‘-(1,4-phenylene)ditetrazolate

Zhi-Jie Ma; Jun Tao; Rui-Yun Huang; Ls Zheng; 郑兰荪


European Physical Journal D | 1999

Application of the Smoluchowski equation to the formation kinetics of cluster ions

Rb Huang; Qiugen Zhang; Hong Chen; Ls Zheng

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L. S. Long

Sun Yat-sen University

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C.T. Au

Hong Kong Baptist University

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Qi Zhang

Pennsylvania State University

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