Hydrothermal synthesis of solid state materials and crystallography için kapak resmi
Hydrothermal synthesis of solid state materials and crystallography
Başlık:
Hydrothermal synthesis of solid state materials and crystallography
Yazar:
Özmen, Bahar.
Yazar Ek Girişi:
Yayın Bilgileri:
[s.l.]: [s.n.], 2004
Fiziksel Tanımlama:
xii, 77 leaves.: ill.+ 1 computer laser optical disc.
Özet:
3 The structure solution of the new polyoxovanadate compound ([V16O31(OH)7]Cl.15H2O), has been done by the SHELX crystal solution software. The compound was synthesized solvothermally at 170 C in the Northwestern University.The compound crystallizes in the space group C2/c of the monoclinic system with eight formula units in a cell of dimensions a . 18.070 (2) A, b . 17.414 (2) A, c . 15.1154 (18) A, .. 97.696 (2), V. 4713.8 (10) A3 (T . 153 K). The structure is composed of vanadium-oxygen clusters encapsulating Cl anion. Each of the V centers has square pyramidal geometry coordinated by five O atoms. The 16 (VO5) units are fused together through common edges to form (V16O38) cage with Cl anion in the middle.The single crystals of the [Ni(en)3(VO3)2] compound was synthesized by hydrothermal method. [Ni(en)3(VO3)2] compound is in the crystal system of hexagonal and in the space group P61. The unit cell parameters are a . 8.9940 (13) A, b . 8.9940 (13) A, c . 34.001 (7) A and alpha . 90 , B . 90 , y . 120 . The structure is composed of VO4 tetrahedras which are joined with others by sharing corners into infinite chains running along the c axis. The complex cation [Ni(en)3]2+ are located between the chains The chain in the compound has a repetitive sequence of 12-nuclear corner-sharing tetrahedras. The compound was synthesized at 160 C for 3 days in the steel reaction autoclaves which have PTFE (Polytetrafluoroethylene) cups in them.By the reaction of the reactants NH4VO3, Ni(NO3)2.6H2O, H3BO3 with H2O the orange crystals of NH4(V3O8) and the green unknown crystals were obtained at 160 C in 3 days..By the reaction of the reactants NaVO3, Ni(NO3)2.6H2O, H3BO3, NH2CH2CH2NH2, with the solvents H3PO4 and H2O the green bulk unknown crystals were obtained at 160 C in 3 days.the reaction of the reactants B4K2O7.H2O, KVO3 with H2O and NH2CH2CH2NH2 brown unknown crystals were obtained at 170 C in 5 days.We have also done some crystal growth studies in our laboratory. There are several known compounds as CoV2O6(H2O)2, Co(VO)2(PO4)2(H2O)4, which were also synthesized in our laboratory with good yields. These crystals were synthesized with other methods and characterized. However we were able to grow their crystals in good shape and size by using hydrothermal method. CoV2O6(H2O)2 was obtained from the reaction of NH4VO3, Co(NO3)2.6H2O and H3BO3. The compound crystallizes in the space group Pnma (62) of the orthorhombic system in a cell of dimensions, a . 5.572 A,b . 10.70 A, c . 11.860 A, alpha . Beta . y . 90 , V . 707.69 A3. CoV2O6(H2O)2 was prepared in a steel autoclave by using ultra pure water as the solvent and heated at 160 C for 3 days. Red prism shaped crystals of the reported materials were obtained with the orange plates in a red-orange crystalline powder. The single crystal XRD results showed that the orange plates have the formula of NH4(V3O8) which crystallizes in the space group P21/m (11) of the monoclinic system in a cell of dimensions a . 4.999 A, b . 8.423 A, c . 7.849 A, B . 96.426 , V . 328.44 A3. It has been shown that CoV2O6(H2O)2 compound can also be synthesized by the reaction of NaVO3, GeO2, H3BO3, CoCl2.6H2O with H2O as the solvent.The green crystals of the compound Co(VO)2(PO4)2(H2O)4 were synthesized from the reaction of V2O5, H2C2O4.2H2O, CoCl2.6H2O with the solvents H3PO4 and H2O at 160 0C for 3 days. The compound crystallizes in the space group I4/mmm (139) of the tetragonal system in a cell of dimensions a . 6.264 A, c . 13.428 A, alpha . B . y . 90 , V . 526.88 A3.
Tek Biçim Eser Adı:
Thesis (Master)--İzmir Institute of Technology:Chemistry

İzmir Institute of Technology:Chemistry--Thesis (Master).
Elektronik Erişim:
Acces to Electronic Version.
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