نتایج جستجو برای: crystal
تعداد نتایج: 159113 فیلتر نتایج به سال:
the zinc(ii) complex [zn2(dmdtc)2(μ-dmdtc)2] has been synthesized directly from thiram ligand, containing a disulfide bond {dmdtc = n,n-dimethyldithiocarbamate; thiram = n,n-tetramethylthiuram disulfide}, and characterized by elemental analysis and spectroscopic methods. surprisingly thiram, undergoes a reductive disulfide bond scission upon reaction with zn2+ in methanolic media to give the [z...
a major hurdle in pharmaceutical formulation is water insolubility of most of drugs affecting their stability and bioavailability. if the drug is also insoluble in organic medium, it is difficult to deliver it in a sufficiently bioavailable form and hence it is a great challenge to formulation researchers to overcome such difficulty. although some approaches are available for enhancing the diss...
N'-(2-hydroxy-3-methoxybenzylidene)-4-methylbenzenesulfonohydrazide (1) was prepared by the reaction of p-Toluenesulfonyl hydrazide and 2-hydroxy-3-methoxy benzaldehyde (1:1 molar ratio) in ethanol under reflux condition. The crystal structure of the compound was determined by X-ray crystallography. Crystal data for 1 at -100 K: space group C/2c with: a = 15.807(1) Å, b = 10.457(1) Å, c = 20.77...
for several recent years, syntheses of spherical zeolitic materials, such as S-1, ZSM-5 and Beta, have been reported using an anion exchange resin as macro-templates. Conceptually, these syntheses are based on the use of a colloidal crystal templating process. The advantage of this method is preparation of pure self-bonded zeolite micro/macrostructures. In this paper the synthesis of TS-1 is...
Morphology and crystal size of zeolites have an important role for their specific use in industries. Many parameters are found to be highly important in the physical appearance of the final zeolite products. In this work, some of the most effective parameters influencing the crystal size and morphology of zeolite A such as temperature and aging time of the gel preparation, crystallization...
محاسبه انرژی آزاد هلمهولتز و معادله حالت بلور fcc با مولکولهای با برهمکنش کره سخت-یوکاوا به روش ابنر
The Helmholtz free energy and equation of the state of an fcc crystal are calculated, where the interaction between the molecules is hard sphere-Yukawa potential. Here the perturbational density functional method is used. This method is introduced by Ebner and co-workers. In this method the density functional Taylor expansion is applied for the crystal configuration up to second order. And for...
ZnO and Cu doped[1] (CZO) thin films were prepared by radio frequency sputtering. The structural and optical properties of thin films were investigated using X-ray diffraction (XRD), atomic force microscopy (AFM), optical spectrophotometer, and photoluminescence (PL) techniques. ZnO thin films showed crystalline and micro-stress defects in the crystal lattice. Annealing of CZO thin films increa...
Nonlinear optical crystal of L-methioninium nitrate was grown by slow evaporation method from aqueous solution at room temperature. The lattice parameters and crystal structure of the grown crystal were identified and confirmed using single crystal X-ray diffraction analysis. Fourier transform infrared spectroscopy analysis was made to study the vibrational functional groups present in the crys...
The reaction of [PPhJ, NOS,] with CuCl and KSCN (1 :3:3) in acetone produces the yell-ow crystals of [PPh,], [WOS,(CuNCS),]. The crystals are triclinic, space group P1(2), z=2, a=12.4823(7), b=12.9224(7), c=18.6395(10)?, ?=83.907(5), ?= 73.152(4), Y= 65.194(4)'. The crystal structure was determined by single crystal Xray diffraction methods (Mo-K ?) and refined by least-squares calculations ...
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