Nanjing Tech University

About: Nanjing Tech University is a education organization based out in Nanjing, China. It is known for research contribution in the topics: Catalysis & Membrane. The organization has 21827 authors who have published 21794 publications receiving 364050 citations. The organization is also known as: Nangongda & Nánjīng Gōngyè Dàxúe.

Five 3D metal–organic frameworks constructed from V-shaped polycarboxylate acids and flexible imidazole-based ligands

Abstract: Five new metal–organic frameworks, namely, Cd2(SA)(obix) (1), Zn2(SA)(bimb) (2), Cd(SDBA)(timb)·3H2O (3), Co(SDBA)(bimb) (4), and Co(SDBA)(obix) (5) (H4SA = 3,3′,4,4′-diphenylsulfonetetracarboxylate acid, H2SDBA = 4,4′-dicarboxybiphenyl-sulfone, obix = 1,2-bis(imidazol-1-ylmethyl)benzene, timb = 1,3,5-tris(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene and bimb = 4,4′-bis(imidazol-1-ylmethyl)biphenyl), have been synthesized under hydrothermal conditions by employing mixed ligands of various imidazole-based ligands with H4SA or H2SDBA. The networks exhibit a variety of topologies and coordination modes at the metal centers. Complex 1 features a novel (5,7)-connected seh net consisting of one-dimensional inorganic chains which are bridged by carboxylate groups of SA4− ligands, whereas complex 2 possesses a unique 4-connected 3D framework with (62·82·102)(62·83·10)(62·83·9) topology. Complex 3 exhibits a rare (3,5)-connected 3D framework with gra topology. Complex 4 shows 4-connected MOFs with (65·8) CdSO4-type topology, while in 5, the SDBA and obix ligands linked the Co(II) atoms into a deeply corrugated 2D sheet. The corrugated 2D sheets polycatenate each other in a parallel manner yielding a rare 2D → 3D parallel polycatenation net. The photoluminescence properties of 1–3 were studied in the solid state at room temperature. Moreover, the second-harmonic-generation (SHG) activity of 2–5 have also been investigated.

Personal experience with four kinds of chemical structure drawing software: review on ChemDraw, ChemWindow, ISIS/Draw, and ChemSketch.

Abstract: Chemical structure drawing software is specialized in the chemical structural information with regards to processing, storing, rendering, and editing. With the advent of bioinformatics and chemoinformatics explosion, professional chemical informatics software for personal computers developed rapidly. For the complexity and specialty of chemical information, to use general-purpose drawing software in chemical structure drawing was painstaking and inefficient. The result was unsatisfactory even in the case of simple molecular drawings. The expression of three-dimensional molecular structure and the conversion of molecular structure from two-dimensional to three-dimensional (2D to 3D) were unfeasible by common graphic software. More than a dozen years ago, chemical professionals made use of ink-pen and chemical stencil sets to prepare papers or presentations. Freehand chemical drawing was not uncommon in professional publications. Nowadays, people in chemistry get use to a variety of chemical drawing software in dozens-megabits size. The slim and compact software for chemical drawing of the DOS time seems to be a remote memory. If it was a rarity in the DOS time, the chemical drawing software is commonplace now. Chemists use it everyday. There are more than a dozen popular chemical drawing software, 1 such as ChemDraw, ChemWindow, ChemPen, C-Design, ChemFrontier, DrawMol, and MolDraw, which belong to standalone ones, and ISIS/Draw, ChemSketch, and Chemistry 4-D Draw, which work as interfacial software or add-ins. Interfacial software is usually a member of a suite and could be used independently. Powerful standalone software such as ChemDraw and ChemWindow are members of commercial suites. This article is based on the authors’ experiences with ChemDraw, ChemWindow, ISIS/Draw, and ChemSketch; the current version of ours is 5.0 Ultra, 6.0, 2.5, and 5.12, respectively.

Shape-controlled synthesis of NiCo2S4 and their charge storage characteristics in supercapacitors

Abstract: In this work, a facile hydrothermal approach for the shape-controlled synthesis of NiCo2S4 architectures is reported. Four different morphologies, urchin-, tube-, flower-, and cubic-like NiCo2S4 microstructures, have been successfully synthesized by employing various solvents. The obtained precursors and products have been characterized by X-ray diffraction, field-emission scanning electron microscopy and transmission electron microscopy. It is revealed that the supersaturation of nucleation and crystal growth is determined by the solvent polarity and solubility, which can precisely control the morphology of NiCo2S4 microstructures. The detailed electrochemical performances of the various NiCo2S4 microstructures are investigated by cyclic voltammetry and galvanostatic charge–discharge measurements. The results indicate that the tube-like NiCo2S4 exhibits promising capacitive properties with high capacitance and excellent retention. Its specific capacitance can reach 1048 F g−1 at the current density of 3.0 A g−1 and 75.9% of its initial capacitance is maintained at the current density of 10.0 A g−1 after 5000 charge–discharge cycles.