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Introduction Polymetallic metallocene complexes having two, three or more transition metal centers of group 4 elements have been one of the most exciting developments in the area of catalysis and organometallic chemistry [1, 2, 3].
The reason for that could be attributed to the unique catalytic transformations arising from cooperative catalytic effects between multiple metal centers and the influence of steric effects, the structure of the bridge and the metallocene ligands on both sides of the bridge [4, 5, 6].
The 1HNMR spectra of 1 shows both one singlet signal for the terminal cyclopentadienyl ligands, two triplets according to the A2B2 system of the bridging C5H4 groups, two triplets for the methylene group units SCH2 and CpCH2 in the expected ranges, thus proofing the proposed structure as well as the elemental analysis.
Mülhaupt, Plenio: Journal of Organometallic Chemistry Vol.460(1993), p.191-195
Kim,et al.: Journal of Polymer Science Part A: Polymer Chemistry Vol.35(1997), p.3717-3728

Surface tension Every day, nature surprises us with structures and patterns of such beauty as to fill the scientist with wonder and the artist with envy.
Soap bubbles have an interesting chemical structure.
Monk: Physical Chemistry-Understanding Our Chemical World (John Wiley &Sons, New York 2004)
Atkins, J. de Paula: ATKINS’ Physical Chemistry(Seventh Edition) (Oxford University Press, Oxford, UK 2002)
Nibler: Experiments in Physical Chemistry (McGraw-Hill, Boston 2003).

WO3 and WO3-Ta2O5 have a porous structure consistent with previously reported results for WO3 [8].
Ta2O5 films are extremely smooth and there is no crack structure.
Radhakrishnan, Materials Chemistry and Physics Vol. 77 (2003) p. 117
Kaneko Journal of Electroanalytical Chemistry (2003), In Press [7] W.C.
[10] P.T.Kissinger, W.R.Heineman, Laboratory Techniques in Electroanalytical Chemistry, (Marcel Derker, New York, 1996).

For sample C, it contained less metakaolin particles and a larger portion of gel structure than sample A and B respectively.
The microstructures show the sample that contained high NaOH concentration had a large portion of gel structure because the high NaOH concentration could dissolve the raw materials to SiO4 and AlO4 species more efficient than low NaOH concentration in a result of more complete geopolymerization.
Chemistry of Materials.
Chemistry of Materials 2001. 13(11): p. 3882-3887
Materials Chemistry and Physics, 2009. 113(1): p. 441-444

The Effect of Si/Al ratio on Selective Catalytic Reduction of NOx with NH3 over Pt/Al-SBA-15 Min Kang1, Jae Hyun Park2, Eun Duck Park2, Ji Man Kim 3, Dae Jung Kim 4 and Jae Eui Yie1,a 1 Department of Applied Chemistry, Ajou University, Suwon 443-749 Republic of Korea 2 Division of Energy Systems Research, Ajou University, Suwon 443-749 Republic of Korea 3 Department of Chemistry, Sungkyunkwan University, Suwon 440-746 Republic of Korea 4 Department of Chemistry & Biotechnology, Texas Tech University, Lubbok, TX 79409-1061, USA a yie@ajou.ac.kr, Keywords: NH3-SCR, Pt, Al-SBA-15, aluminum content, low temperature, Abstract.
Table 1 and Fig. 1 indicate that the pore structure is nearly unchanged even after the alumination and platinum impregnation..
It is noteworthy that the mesopore structure is retained after the incorporation of aluminum and platinum impregnation.

Preparation and Performance Research of Hemostatic Powder of Chitosan mixed with Scutellaria Baicalensis Jing Li1,a, Chang-Ping Wei1,b, Feng-Ming Wang1, Li-Dan Dong1, Shuang Sun1, Qin-Yi Liu2,c 1School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China 2the second Hospital of Jilin University, Changchun 130022, China a245711992@qq.com, bchangpingwei@hotmail.com, c1226527208@qq.com Keywords: chitosan,baicalin,preparation,performance research Abstract.
Because the oxygen atom of pyrone ring can provide lone pair electrons, which can form p-π conjugate with the double bond around, making the single bond of CO become weak and the double bond of CO become strong. compared with the characteristic absorption peaks of aromatic ketone, its wave number was lower.The absorption peaks at 742 cm-1 and 682 cm-1 were respectively assigned to bending vibration of =C-H and C=C, it suggested that there was single substituted benzene in the structure of molecule.
[11] R.S.Xu:Chemistry of Natural Product(science press,China,1993),p.588.
(In Chinese) [12] J.X.Xie,J.B.Chang:Application of Infrared Spectroscopy in Organic Chemistry and Pharmaceutical Chemistry(science press,China,2001),p.403.

It has found numerous applications in chemical analysis, like, organic molecules, silicon structures, crystallographic orientation sampling, etc.
Industrial & Engineering Chemistry Research, 2012. 51(44): p. 14317-14324
Industrial & Engineering Chemistry Research, 2009. 48(5): p. 2717-2720
Industrial & engineering chemistry research, 2005. 44(26): p. 9894-9903
Industrial & engineering chemistry research, 1996. 35(4): p. 1107-1114

However, the measurements of pH using the above-mentioned conductive polymers had poor reliability due to defects and pinholes present in the films structure.
Moutet: Coordination Chemistry Reviews.
Takahashi: Journal of Electroanalytical Chemistry.
Zambonin: Journal of Electroanalytical Chemistry.
Grimes: Analytical Chemistry.

CO produces several surface forms, and methanol forms methoxyl complexes with various structures [5].
The phase composition of the samples, the porous structure and specific surface area structure, the volume and size of pores of samples are presented in article part 1.
Lin, Theoretical basis of the synthesis of methanol,Chemistry, Moscow, 1990
IV Kalechits, Chemistry, Moscow, 1980
Lin, Theoretical basis of the synthesis of methanol, Chemistry, Moscow, 1990.

Synthesis of Poly (1-vinyl-1,2,4-triazole) and Preparation of Proton Conducting Membrane for High Temperature Operation IRFAN Gustian 1, , SEVIM Unugur Celik 2, Ayhan Bozkurt 3, 1 Universitas Bengkulu, Department of Chemistry-Faculty of Mathematics and Natural Sciences, 38371 JI, Raya Kandang Limun-Bengkulu, Indonesia 2 Department of Chemistry, Fatih University, 34500 Buyukcekmece-Istanbul, Turkey 3 Department of Chemistry, Fatih University, 34500 Buyukcekmece-Istanbul, Turkey aunibfan@yahoo.com, bsunugur@fatih.edu.tr, cbozkurt@fatih.edu.tr Keywords: Poly (1-vinyl-1,2,4-triazole), Nitrilotri (methyl triphosphonic acid), Proton conducting membrane, High temperature Abstract.
A common technique used in the synthesis of anhydrous proton conducting material, namely the doping of proton solvent into the polymer matrix so that proton transport occurs almost entirely through the diffusion structure.
The procedure is done through the blending of neutral/basic polymer with a phosphoric acid, and can also by doping the polymer with an acidic heterocyclic structure [5].
In poly(4 (5)-vinyl-imidazole), polymer–acid complexation blocked the imidazole ring nitrogens and inhibited the structure diffusion at higher acid contents.
Bozkurt Journal of Physics and Chemistry of Solids 65 (2004) 1659 -1662 [11] S.Ü.