نتایج جستجو برای: monoclinic crystal
تعداد نتایج: 161019 فیلتر نتایج به سال:
The structure of 1-methyl-2-(prop-2-en-1-ylsulfan-yl)-1H-imidazol-3-ium bromide, C7H11N2S(+)·Br(-), has monoclinic (P21/c) symmetry. In the crystal, the components are linked by N-H⋯Br and C-H⋯Br hydrogen bonds. The crystal structure of the title compound undeniably proves that methimazole reacts through the thione tautomer, rather than the thiol tautomer in this system.
Transformation of deuterated ethanol from the plastic crystal phase into the monoclinic one is investigated by means of a singular setup combining simultaneously dielectric spectroscopy with neutron diffraction. We postulate that a dynamic transition from plastic crystal to supercooled liquid-like configuration through a deep reorganization of the hydrogen-bonding network must take place as a p...
In this paper, the structure of a new 16-membered macrocyclic Schiff base compound N,N′-(3,3′-dimethoxy-2,2′-(propane-1,3-diyldioxy)dibenzylidene)propane-1,3-diamine, C22H26N2O4 (1), derived from 1,3-propanediamine and 3,3′-dimethoxy-2,2′-(propane-1,3-diyldioxy)dibenzaldehyde has been studied by single crystal X-ray diffraction, DFT calculations at B3LYP/6-31G** and FT-IR spectroscopy. The titl...
A proton transfer compound (2a4mpH)2(btcH2) was obtained by the reaction of benzene-1,2,4,5-tetracarboxylic acid (btcH4) with 2-amino-4-methyl pyridine (2a4mp), 1:1 mole ratio and is characterized by IR spectroscopy and single crystal X-ray diffraction analysis. The ion pair is crystallized in monoclinic system and P21/c space group with following cell parameters: a = 11.321(2) Å, b = 13.553(2)...
In this research N(2-chloro-phenyl)4-nitro-thiobenzamide as a ligand was synthesized. One mmol of mercury oxide was added to the solution of 1 mmol ligand in 45 ml chloroform and after 90 min the mixture through celite or BaS to remove unreacted mercury(II) compounds. The yellow crystals, which formed by slow evaporization, was separated and recrystallized from chloroform as fine yellow crystal...
Sildenafil citrate monohydrate, well known as Viagra R ©, is a drug for the treatment of erectile dysfunction. Here we present the X-ray crystal structure of the sildenafil base, C22H30N6O4S. The compound crystallizes in the monoclinic system, space group P21/c with the unit cell parameters a = 17.273(1), b = 17.0710(8), c = 8.3171(4) Å, β = 99.326(2), Z = 4, V = 2420.0(3) Å3. A comparison with...
A 1:1 co-crystal of rac-trans-1,2-C(6)H(10)(OH)(2) and (C(6)H(5))(3)PO has been found that is unusual because there are no strong interactions between the two kinds of molecules, which are segregated into layers. Furthermore, neither pure rac-1,2-cyclohexanediol (CHD) nor pure triphenylphosphine oxide (TPPO) has any obvious packing problem that would make the formation of inclusion complexes li...
The compound of (Htmb)2[Ni(pydc)2)].H2O (1) (In that tmb and pydc are 3,3¢,5,5¢-tetramethyl benzidine and pyridine -2,6- dicarboxylic acid, respectively) was synthesized via the proton transfer method and the structure was determined by single crystal X-ray diffraction. This compound crystalized in monoclinic crystal system and C2/c space group. In the asymmetry unit of compound 1, there are h...
In this paper, MnCl,.4H,O crystals with monoclinic structure, for the study of magnetic hyperfine field in magnetic crystal at low temperature, have been grown. To study the effect of impurities on T, (spin-lattice relaxation time), crystals with different percent of "Co impurities, from saturated mixed solution of MnCl,.4H,O and CoCl,.6H,O at temperature of 30Q'K, have been grown. The pe...
Using density functional total energy calculations the structural phase stability and pressureinduced structural transition in different polymorphs of ZnSiO3 and Zn2SiO4 have been studied. Among the considered possible ZnSiO3 polymorphs, monoclinic phase with space group P21/c is found to be the most stable one. At high pressure monoclinic ZnSiO3 (C2/c) can coexist with orthorhombic (Pbca) modi...
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