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Redetermination of the Niobium(V) Precursor, [NbCl5(NCCH3)] HERBST Leandra a *, VISSER Hendrik G. b and ROODT Andreas c Department of Chemistry, University of the Free State, P.O.
The labile coordinated acetonitrile ligand creates the possibility of displacement chemistry with suitable ligands e.g. acetylacetone type ligands.
Earnshaw, Chemistry of the elements, Butterworths/Heinemann, Oxford (1997) 977
Sands, The crystal structure of NbCl5, Acta Cryst. 11 (1958) 615-619
Spagna, SIR97: a new tool for crystal structure determination and refinement, J.

Similar blocks of the crystal structure were observed for the filled β - MnO2 phases [10, 11, 12].
Deiseroth, SnAl6Te10, SnGa6Te10 and PbGa6Te10: superstructures, symmetry relations and structural chemistry of filled β-manganese phases, Z. 
Geller, Crystal structure of the solid electrolyte, RbAg4I5, Science 157(3786) (1967), 310-312
Rachiy, Mechanisms of charge accumulation in electrochemical systems formed based on of nanoporous carbon and manganese oxide, Physics and Chemistry of Solid State 21(4) (2020) 621-627
Yaremiy, Synthesis and electrochemical properties of LaMnO3 perovskite nanoparticles, Physics and Chemistry of Solid State 21(2) (2020) 219-226.

Yttria is being used for many high technology applications due to its excellent high temperature stability, high affinity for oxygen and sulfur and well-defined crystal structures, whose properties can be tailored by incorporating different types of ions into the structure [5] .
The chemistry of the polyacrylamide gel procedure is shown in Fig.1.
Ignitation: polyacrylamide gel: Polymerization: Fig.1 The chemistry reactions of polymerization Results and Disscussion Calcination Procedure.
Riley: Materials Chemistry and Physics Vol.67 (2001), p.175

highly hydrated state and therefore it is limited to operation at relatively low temperatures of around 80℃ under ambient pressure in order to maintain a high water content in themembrane[6].The major factors hindering the development of PFSA are higher prices,complex production engineering and high risk.Consequently,their wider applications are limited.To overcome the disadvantages of PFSA, new proton exchange membranes have appeared. 3 Partially fluorinated proton exchange membrane 3.1 Polytrifluorostyrene membrane Early Polytrifluorostyrene sulfonic acid membrane cannot meet the requirements of the long-term use of fuel cells,because of poor mechanical strength and chemical stability.The most prominent representatives of modified proton exchange membrane is BAM3G membrane developed by Ballad company.The life of BAM3G membrane can be increased, up to 15000h.Cost is also lower than the Nafion membrane and the Dow membrane,that is much more easily accepted[7].Due to the differences in structure
Ren et al. fabricate the cross-linking Am-SPAES/SiO2 hybrid membranes,and the performance of the hybrid membranes containing cross-linking network structure was considerably improved[14].Luo et al. prepare a double cross-linked membrane.The second cross-linking significantly decreased the water uptake of the membrane.
Table 1 Performance reference table of partially fluorinated membrane BAM3G Radiation grafted Crosslinked Thermal stability good good low Chemistry stability good good good Mechanical strength good good enhance Methanol permeability low low Proton conductivity improve limited equal decreace Oxidation stability worse 4 Conclusion Perfluorosulfonic acid membranes with better performance have the issues of complicated preparation process and high cost.Besides,the poor alcohol resistance restricts its application.
[7] Z.X.Liu,W.Qian,J.W.Guo,J.Zhang,C.Wang,Z.Q.Mao:Materials for proton exchange membrane fuel cell.Progress in chemistry,23(2011),p.487-500
[11] Y.S.Joon,J.S.Hae,M.S.Joo,H.S.Jun,C.N.Young:Radiation-grafted proton exchange membranes based on co-grafting from binary monomer mixtures into poly(ethylene-co-tetrafluoroethylene) (ETFE)film.Radiation Physics and Chemistry,81(2012),p.923-936

The influence of acrylic acid irradiation grafting to the hydrophilicity of polypropylene spunbonded nonwovens Lei Xia1,2,a, Peng Xi3,4,b, Bowen Cheng1,2,3,c 1School of Textile, Tianjin Polytechnic University, Tianjin 300160, China 2Key Laboratory of Advanced Textile Composites, Ministry of Education of China, Tianjin 300160, China 3Tianjin Multicipal Kay Lab of Fiber Modification and Functional Fiber, Tianjin Polytechnic University, Tianjin 300160, China 4State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry Chinese Academy of Sciences, Beijing 100080, China axia1983@163.com, bxipeng@tjpu.edu.cn, cbowen@tjpu.edu.cn Keywords: polypropylene, Hydrophilic modified, irradiation grafting, spunbond.
But the macromolecular structure of polypropylene doesn’t contain the hydrophilic group, the hydrophilicity of the fabric is extremely terrible and limited the scope of its application [4-6].
This is because with the increasing of irradiation dose, some of the intermolecular structure may destroyed, therefore, the breaking strength decreased correspondingly.
Radiation Physics and Chemistry, 2000, 57(5):179-186

The examination of X-ray diffraction provides us with a lot of information about the crystal structure of zinc oxide, lattice dimensions, and others.
Where the figure (1) shown the positions of 31.63ᵒ, 34.50ᵒ, 36.25ᵒ, 47.50ᵒ, 56.60ᵒ, 62.80° and 67.92° of peaks a = b = 3.249 Å, c = 5.206 Å with space group P63mc and the indexed is the hexagonal structure, at pH = 8 the average crystallite size is 3 nm, at pH = 10 the average crystallite size is 15 nm and at pH = 12 the average crystallite size is 40 nm as a spherical particles assessed by Scherrer's equation .
Journal of agricultural and food chemistry 59.8 (2011): 3485-3498
"Gold nanoparticles: assembly, supramolecular chemistry, quantum-size-related properties, and applications toward biology, catalysis, and nanotechnology." 
The Journal of Physical Chemistry B 108.26 (2004): 8773-8777

Electronic structure study of CO adsorption on the Fe (001) surface, The Journal of Physical Chemistry B. 105 (2001) 164-172 [17] Cheng H, Reiser D B, Dean S W, et al.
Structure and energetics of iron pentacarbonyl formation at an Fe(100) surface, The Journal of Physical Chemistry B. 105 (2001) 12547-12552 [18] Louie S G, Froyen S, Cohen M L.
The structure of magnetite, Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry. 37(1981): 917-920 [20] Henrich V E, Shaikhutdinov S K.
Surface structures of Fe3O4 (111),(110), and (001): A density functional theory study, Journal of Fuel Chemistry and Technology. 38 (2010) 121-128 [23] Wu G, Zhang J, Wu Y, et al.
CRC handbook of chemistry and physics 1999-2000: a ready-reference book of chemical and physical data, in: D.R.

China 2Laboratory of New Materials, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, P.
PLGA (50:50) and PLLGA (50:50) were prepared by coploymerizing polylactic acid (PLA) and polyglycolic acid (PGA), supplied by Changchun Institute of Applied Chemistry.
PLGA (50:50) and PLLGA (50:50) both should lead to regular patterns due to their similar molecular structures.
SEM images of honeycomb structure in PPO films.
Ordered honeycomb-structured films from dendronized PMA-b-PEO rod-coil block copolymers Macromol.

Dyeing research of aramid fiber-Nomex Tan Yanjun1 a ,Yu Yan’e2 b 1Xi’an Polytechnic University, China 2Xi’an Polytechnic University, China alcntyj@tom.com, byuyane@xpu.edu.cn Keywords: Nomex, chemistry method dye, dyeing Abstract.
Its molecule backbone consists of amide group and benzene group and this chemical structure results in its chemical stability, heat stability, high density and high modulus.
The chemical structure of Nomex (m) is shown below: [1].
According to the chemical structure it can be seen that Nomex consists of long linear molecule, which is made up of amide groups linked with m-benzene groups.

Since the organized supramolecular structures are very sensitive to and dependent on the molecular structure of the amphiphiles, the design of amphiphilic molecules is of the utmost importance.
The structure of final product is shown in Fig. 1, abbreviated as C18TSB, which was confirmed by 1H NMR.
Chemical structure of trigonal Schiff base compound C18TSB.
Short rod structure appeared in the C18TSB/TPPS complex film.
Lehn, Supramolecular Chemistry: Concepts and Perspectives, Wiley-VCH, Weinheim, 1995