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Professor Ivana Evans' Outputs (105)

Transition metal complexes with pyrazole-based ligands. XIX. Diaquabis(3,5-dimethyl-1H-pyrazole-1-carboxamidine-kappa N-2,N `)metal(II) dinitrate, with metal = Co and Ni (2004)
Journal Article
Jacimovic, Z., Leovac, V., Szecsenyi, K., Howard, J., & Evans, I. (2004). Transition metal complexes with pyrazole-based ligands. XIX. Diaquabis(3,5-dimethyl-1H-pyrazole-1-carboxamidine-kappa N-2,N `)metal(II) dinitrate, with metal = Co and Ni. Acta crystallographica. Section C, Crystal structure communications, 60(10), M467-M470. https://doi.org/10.1107/s0108270104017433

Mo2P4O15 - the most complex oxide structure solved by single crystal methods? (2004)
Journal Article
Lister, S., Evans, I., Howard, J., Coelho, A., & Evans, J. (2004). Mo2P4O15 - the most complex oxide structure solved by single crystal methods?. Chemical Communications, 2540-2541. https://doi.org/10.1039/B408413F

We report the crystal structure and phase transitions of Mo2P4O15 which, despite a simple chemical formula, has 441 crystallographically unique atoms in its asymmetric unit and thus has the most complex structure of any extended oxide reported to dat... Read More about Mo2P4O15 - the most complex oxide structure solved by single crystal methods?.

Isogentisin (1,3-dihydroxy-7-methoxyxanthone) (2004)
Journal Article
Evans, I., Howard, J., Savikin-Fodulovic, K., & Menkovic, N. (2004). Isogentisin (1,3-dihydroxy-7-methoxyxanthone). Acta crystallographica. Section B, Structural science, 60, O1557-O1559

The crystal structure of isogentisin, C14H10O5, a natural product isolated from Gentiana lutea, has been determined. The phenolic ring system is essentially planar and the displacement of the methoxy substituent from the mean molecular plane is very... Read More about Isogentisin (1,3-dihydroxy-7-methoxyxanthone).

Variable temperature studies of a polymorphic system comprising two pairs of enantiotropically related forms: S,S -ethambutol dihydrochloride (2004)
Journal Article
Rubin-Preminger, J., Bernstein, J., Harris, R., Evans, I., & Ghi, P. (2004). Variable temperature studies of a polymorphic system comprising two pairs of enantiotropically related forms: S,S -ethambutol dihydrochloride. Crystal Growth and Design, 4(3), 431-439. https://doi.org/10.1021/cg0341959

Of the four known polymorphs of [S,S] -ethambutol dihydrochloride, two transform in an enantiotropic single-crystal-to-single-crystaI phase transformation from Form II to Form I on heating. The crystal structures of these two forms have been solved a... Read More about Variable temperature studies of a polymorphic system comprising two pairs of enantiotropically related forms: S,S -ethambutol dihydrochloride.

Synthesis, characterization and crystal structure of a novel Ni(II) complex, Ni(L-H)(2) (L=3,5-dimethyl-1-thiocarboxamidopyrazole) (2004)
Journal Article
Evans, I., Howard, J., Szecsenyi, K., Leovac, V., & Jacimovic, Z. (2004). Synthesis, characterization and crystal structure of a novel Ni(II) complex, Ni(L-H)(2) (L=3,5-dimethyl-1-thiocarboxamidopyrazole). Journal of Coordination Chemistry, 57(6), 469-476

A new complex, Ni(L-H)(2), L = 3,5-dimethyl-1-thiocarboxamidopyrazole, has been synthesized and characterized by IR spectroscopy, magnetic and electrical measurements. Its crystal structure was solved from powder X-ray diffraction data. The compound... Read More about Synthesis, characterization and crystal structure of a novel Ni(II) complex, Ni(L-H)(2) (L=3,5-dimethyl-1-thiocarboxamidopyrazole).

An X-ray powder diffraction study of the spin-crossover transition and structure of bis (2,6-dipyrazol-1-ylpyrazine)iron(II) perchlorate (2004)
Journal Article
Money, V., Evans, I., Elhaik, J., Halcrow, M., & Howard, J. (2004). An X-ray powder diffraction study of the spin-crossover transition and structure of bis (2,6-dipyrazol-1-ylpyrazine)iron(II) perchlorate. Acta crystallographica. Section B, Structural science, 60, 41-45

The crystal structure of the iron(II) spin-crossover compound [Fe(C10H8N6)(2)](ClO4)(2) in the high-spin state has been solved from powder X-ray diffraction data using the DASH program and refined using Rietveld refinement. The thermal spin transitio... Read More about An X-ray powder diffraction study of the spin-crossover transition and structure of bis (2,6-dipyrazol-1-ylpyrazine)iron(II) perchlorate.

alpha-Bi2Sn2O7 - a 176 atom crystal structure from powder diffraction data (2003)
Journal Article
Evans, I., Howard, J., & Evans, J. (2003). alpha-Bi2Sn2O7 - a 176 atom crystal structure from powder diffraction data. Journal of materials chemistry, 13(9), 2098-2103. https://doi.org/10.1039/b305211g

Pyrochlore-type bismuth tin oxide, Bi2Sn2O7, is a technologically important material used in applications such as catalysis and gas sensing. Its room temperature structure has been solved by a method of simulated annealing of combined X-ray and neutr... Read More about alpha-Bi2Sn2O7 - a 176 atom crystal structure from powder diffraction data.

Variable temperature in situ X-ray diffraction study of mechanically activated synthesis of calcium titanate, CaTiO3 (2003)
Journal Article
Evans, I., Howard, J., Sreckovic, T., & Ristic, M. (2003). Variable temperature in situ X-ray diffraction study of mechanically activated synthesis of calcium titanate, CaTiO3. Materials Research Bulletin, 38(7), 1203-1213

The effect of mechanical activation on formation of calcium titanate (CaTiO3) from calcined mixtures of CaCO3 and TiO2 was studied by monitoring the course of this solid-state reaction by variable temperature in situ X-ray diffraction (XRD) experimen... Read More about Variable temperature in situ X-ray diffraction study of mechanically activated synthesis of calcium titanate, CaTiO3.

The spin-states and spin-crossover behaviour of iron(II) complexes of 2,6-dipyrazol-1-ylpyrazine derivatives (2003)
Journal Article
Elhaik, J., Money, V., Barrett, S., Kilner, C., Evans, I., & Halcrow, M. (2003). The spin-states and spin-crossover behaviour of iron(II) complexes of 2,6-dipyrazol-1-ylpyrazine derivatives. Dalton Transactions, 2053-2060. https://doi.org/10.1039/b210368k

The syntheses of [FeL2]X2 (L = 2,6-dipyrazol-1-ylpyrazine [L2H], 2,6-bis{3-methylpyrazol-1-yl}pyrazine [L2Me], 2,6-bis{3,5-dimethylpyrazol-1-yl}pyrazine [L2Me2] or 2,6-bis{3-[2,4,6-trimethylphenyl]pyrazol-1-yl}pyrazine [L2Mes]; X− = BF4− or ClO4−) ar... Read More about The spin-states and spin-crossover behaviour of iron(II) complexes of 2,6-dipyrazol-1-ylpyrazine derivatives.

Synthesis, crystal structure, and oxide ion conductivity in Bi4.6Ca1.1VO10.5 (2002)
Journal Article
Evans, I., Tao, S., Irvine, J., & Howard, J. (2002). Synthesis, crystal structure, and oxide ion conductivity in Bi4.6Ca1.1VO10.5. Chemistry of Materials, 14(9), 3700-3704

A novel bismuth calcium vanadate, Bi4.6Ca1.1VO10.5, has been synthesized. Its crystal p structure has been determined by synchrotron X-ray diffraction. The compound crystallizes in orthorhombic space group Pnnm, with cell parameters a = 11.930(2) (A)... Read More about Synthesis, crystal structure, and oxide ion conductivity in Bi4.6Ca1.1VO10.5.

Variable temperature structural study of bismuth lead vanadate, BiPb₂VO₆ (2002)
Journal Article
Evans, I., Evans, J., & Howard, J. (2002). Variable temperature structural study of bismuth lead vanadate, BiPb₂VO₆. Journal of materials chemistry, 12(9), 2648-2652. https://doi.org/10.1039/b202648a

At room temperature, monoclinic BiPb2VO6 is a polar, noncentrosymmetric, second harmonic generation active material and its crystal structure is among the more complex to be solved ab initio from powder diffraction data. In its stability range, BiPb2... Read More about Variable temperature structural study of bismuth lead vanadate, BiPb₂VO₆.