Thapong Teerawatananond - Academia.edu (original) (raw)
Papers by Thapong Teerawatananond
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
European Journal of Inorganic Chemistry, May 29, 2013
ABSTRACT Silsesquioxane formation competing with the deprotonation of alcohol solvents in the pre... more ABSTRACT Silsesquioxane formation competing with the deprotonation of alcohol solvents in the presence of a strong base to form alkoxides is reported for the first time. Evidently, sodium isopropoxide is formed during the synthesis of the sodium salt of a double-decker octaphenylsilsesquioxane tetrasilanolate in 2-propanol as the solvent, which leads to the formation of unexpected cis- and trans-di[(3-chloropropyl)isopropoxysilyl]-bridged double-decker octaphenylsilsesquioxanes after in situ coupling with 3-chloropropyltrichlorosilane. The desired products were characterized by 1H NMR, 13C NMR, and 29Si NMR spectroscopy; ESI-MS; and single-crystal X-ray diffraction.
Acta Crystallographica Section A, Aug 23, 2008
Poster Sessions LAMOX, the new family of oxide conductors, obtained on the basis of La2Mo2O9 comp... more Poster Sessions LAMOX, the new family of oxide conductors, obtained on the basis of La2Mo2O9 compound with the use of different substitutions is the object for intensive studies. In 2005 year single crystals of the anionic conductor La2Mo2O9 were grown by crystallization from the nonstoichiometric flux [1]. Their polymorphism, domain structure and temperature dependences of conductivity and permittivity were studied [1]. Conductivity of these crystals at 750-600 C reaches 10-1-10-2 Om-1 sm-1. It was established that in dependence of the cooling rate and of the admixture content, these crystals can exist at the room temperature as stable monoclinic A-phase or metastable cubic B1-phase or as their mixture. Obtaining of the most complete and precise structural data about the crystals of cubic metastable B1phase from X-ray experiment was the purpose of the present study. It is important that these studies were done for the first time for single crystals. Cubic cell with a=7.158(1)Å, which was found for the studied single crystal, allowed to index about 84% of measured reflections. While solving the structure (in sp.gr. P213) it was established that La and Mo atoms are shifted from the threefold axes. Occupation of three positions of La and Mo atoms was found to be equal to 100%. Two of the three independent oxygen positions in this crystal are not fully occupied, have quite large thermal parameters and are located at the short distances from each other.
Acta Crystallographica Section A, Aug 22, 2011
Poster Sessions C605 addressed by collecting high quality data at low temperature using a microfo... more Poster Sessions C605 addressed by collecting high quality data at low temperature using a microfocus Cu X-ray source and employing dual-space recycling (SHELXD) for structure solution. The very large numbers of independent molecules present good exercises for the RESI and BLOC commands during refinement. For example, one structure in space group I2 has a unit cell volume of nearly 43 000 Å 3 and contains fourteen independent molecules. Despite a fascinating topological interweaving, more than one-third of the unit cell volume is occupied by solvent molecules that are disordered to the point of being impractical to model. Following application of the SQUEEZE routine in PLATON, the residual R1 decreased from 8.4% to 4.5%.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
R factor = 0.049; wR factor = 0.163; data-to-parameter ratio = 17.5. In the title compound, C7H10... more R factor = 0.049; wR factor = 0.163; data-to-parameter ratio = 17.5. In the title compound, C7H10N2C7H6O2, the components are linked by an O—H N hydrogen bond. The mean planes of two molecules form a dihedral angle of 78.68 (5). The crystal packing exhibits weak non-classical C—H O contacts. Related literature For background to hydrogen bonding in crystal engineering,
Acta Crystallographica Section A Foundations of Crystallography, 2008
Poster Sessions LAMOX, the new family of oxide conductors, obtained on the basis of La2Mo2O9 comp... more Poster Sessions LAMOX, the new family of oxide conductors, obtained on the basis of La2Mo2O9 compound with the use of different substitutions is the object for intensive studies. In 2005 year single crystals of the anionic conductor La2Mo2O9 were grown by crystallization from the nonstoichiometric flux [1]. Their polymorphism, domain structure and temperature dependences of conductivity and permittivity were studied [1]. Conductivity of these crystals at 750-600 C reaches 10-1-10-2 Om-1 sm-1. It was established that in dependence of the cooling rate and of the admixture content, these crystals can exist at the room temperature as stable monoclinic A-phase or metastable cubic B1-phase or as their mixture. Obtaining of the most complete and precise structural data about the crystals of cubic metastable B1phase from X-ray experiment was the purpose of the present study. It is important that these studies were done for the first time for single crystals. Cubic cell with a=7.158(1)Å, which was found for the studied single crystal, allowed to index about 84% of measured reflections. While solving the structure (in sp.gr. P213) it was established that La and Mo atoms are shifted from the threefold axes. Occupation of three positions of La and Mo atoms was found to be equal to 100%. Two of the three independent oxygen positions in this crystal are not fully occupied, have quite large thermal parameters and are located at the short distances from each other.
2023 15th International Conference on Information Technology and Electrical Engineering (ICITEE)
R factor = 0.038; wR factor = 0.107; data-to-parameter ratio = 9.5. The title Schiff base compoun... more R factor = 0.038; wR factor = 0.107; data-to-parameter ratio = 9.5. The title Schiff base compound, C14H12ClNO, was prepared from 4-chlorobenzylamine and salicylaldehyde. The molecule is V-shaped: the dihedral angle between the aromatic rings is 67.51 (5). The rings are located on the opposite side of the C=N bond, giving an E configuration. An intramolecular N— H O hydrogen bond generates a S(6) ring. In the crystal structure, only weak non-classical C—H O contacts are observed. Related literature For background to Schiff base ligands and their biological activity, see: Adsule et al. (2006); Karthikeyan et al. (2006). For related structures, see: Tariq et al. (2010); Khalaji & Simpson (2009). For the graph-set analysis of hydrogen-bond patterns,
Journal of Saudi Chemical Society, 2021
Tetrahedron, 2020
A cyclic lipodepsipeptide, verruculin, a rosigenin and an aposphaerin analogues, verruculinone an... more A cyclic lipodepsipeptide, verruculin, a rosigenin and an aposphaerin analogues, verruculinone and 7-Omethylaposphaerin C, together with six known compounds were isolated from the marine fungus Verruculina enalia BCC 22226. The structures of these compounds were elucidated by extensive spectroscopic analysis. The absolute configuration of verruculin was determined by Marfey's method, and the relative configuration of verruculinone was obtained by X-ray crystallography. Verruculin showed weak antituberculosis and antibacterial activities, while verruculinone displayed cytotoxicity against cancer cell (MCF-7 and NCIeH187) and Vero cell lines.
Marine Drugs, 2016
Six new chamigrane sesquiterpenes, merulinols A-F (1-6), and four known metabolites (7-10) were i... more Six new chamigrane sesquiterpenes, merulinols A-F (1-6), and four known metabolites (7-10) were isolated from the culture of the basidiomycetous fungus XG8D, a mangrove-derived endophyte. Their structures were elucidated mainly by 1D and 2D NMR, while the structures of 1 and 2 were further confirmed by single-crystal X-ray diffraction analysis. The in vitro cytotoxicity of all compounds was evaluated against three human cancer cell lines, MCF-7, Hep-G2, and KATO-3. Compounds 3 and 4 selectively displayed cytotoxicity against KATO-3 cells with IC 50 values of 35.0 and 25.3 µM, respectively.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
European Journal of Inorganic Chemistry, May 29, 2013
ABSTRACT Silsesquioxane formation competing with the deprotonation of alcohol solvents in the pre... more ABSTRACT Silsesquioxane formation competing with the deprotonation of alcohol solvents in the presence of a strong base to form alkoxides is reported for the first time. Evidently, sodium isopropoxide is formed during the synthesis of the sodium salt of a double-decker octaphenylsilsesquioxane tetrasilanolate in 2-propanol as the solvent, which leads to the formation of unexpected cis- and trans-di[(3-chloropropyl)isopropoxysilyl]-bridged double-decker octaphenylsilsesquioxanes after in situ coupling with 3-chloropropyltrichlorosilane. The desired products were characterized by 1H NMR, 13C NMR, and 29Si NMR spectroscopy; ESI-MS; and single-crystal X-ray diffraction.
Acta Crystallographica Section A, Aug 23, 2008
Poster Sessions LAMOX, the new family of oxide conductors, obtained on the basis of La2Mo2O9 comp... more Poster Sessions LAMOX, the new family of oxide conductors, obtained on the basis of La2Mo2O9 compound with the use of different substitutions is the object for intensive studies. In 2005 year single crystals of the anionic conductor La2Mo2O9 were grown by crystallization from the nonstoichiometric flux [1]. Their polymorphism, domain structure and temperature dependences of conductivity and permittivity were studied [1]. Conductivity of these crystals at 750-600 C reaches 10-1-10-2 Om-1 sm-1. It was established that in dependence of the cooling rate and of the admixture content, these crystals can exist at the room temperature as stable monoclinic A-phase or metastable cubic B1-phase or as their mixture. Obtaining of the most complete and precise structural data about the crystals of cubic metastable B1phase from X-ray experiment was the purpose of the present study. It is important that these studies were done for the first time for single crystals. Cubic cell with a=7.158(1)Å, which was found for the studied single crystal, allowed to index about 84% of measured reflections. While solving the structure (in sp.gr. P213) it was established that La and Mo atoms are shifted from the threefold axes. Occupation of three positions of La and Mo atoms was found to be equal to 100%. Two of the three independent oxygen positions in this crystal are not fully occupied, have quite large thermal parameters and are located at the short distances from each other.
Acta Crystallographica Section A, Aug 22, 2011
Poster Sessions C605 addressed by collecting high quality data at low temperature using a microfo... more Poster Sessions C605 addressed by collecting high quality data at low temperature using a microfocus Cu X-ray source and employing dual-space recycling (SHELXD) for structure solution. The very large numbers of independent molecules present good exercises for the RESI and BLOC commands during refinement. For example, one structure in space group I2 has a unit cell volume of nearly 43 000 Å 3 and contains fourteen independent molecules. Despite a fascinating topological interweaving, more than one-third of the unit cell volume is occupied by solvent molecules that are disordered to the point of being impractical to model. Following application of the SQUEEZE routine in PLATON, the residual R1 decreased from 8.4% to 4.5%.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
R factor = 0.049; wR factor = 0.163; data-to-parameter ratio = 17.5. In the title compound, C7H10... more R factor = 0.049; wR factor = 0.163; data-to-parameter ratio = 17.5. In the title compound, C7H10N2C7H6O2, the components are linked by an O—H N hydrogen bond. The mean planes of two molecules form a dihedral angle of 78.68 (5). The crystal packing exhibits weak non-classical C—H O contacts. Related literature For background to hydrogen bonding in crystal engineering,
Acta Crystallographica Section A Foundations of Crystallography, 2008
Poster Sessions LAMOX, the new family of oxide conductors, obtained on the basis of La2Mo2O9 comp... more Poster Sessions LAMOX, the new family of oxide conductors, obtained on the basis of La2Mo2O9 compound with the use of different substitutions is the object for intensive studies. In 2005 year single crystals of the anionic conductor La2Mo2O9 were grown by crystallization from the nonstoichiometric flux [1]. Their polymorphism, domain structure and temperature dependences of conductivity and permittivity were studied [1]. Conductivity of these crystals at 750-600 C reaches 10-1-10-2 Om-1 sm-1. It was established that in dependence of the cooling rate and of the admixture content, these crystals can exist at the room temperature as stable monoclinic A-phase or metastable cubic B1-phase or as their mixture. Obtaining of the most complete and precise structural data about the crystals of cubic metastable B1phase from X-ray experiment was the purpose of the present study. It is important that these studies were done for the first time for single crystals. Cubic cell with a=7.158(1)Å, which was found for the studied single crystal, allowed to index about 84% of measured reflections. While solving the structure (in sp.gr. P213) it was established that La and Mo atoms are shifted from the threefold axes. Occupation of three positions of La and Mo atoms was found to be equal to 100%. Two of the three independent oxygen positions in this crystal are not fully occupied, have quite large thermal parameters and are located at the short distances from each other.
2023 15th International Conference on Information Technology and Electrical Engineering (ICITEE)
R factor = 0.038; wR factor = 0.107; data-to-parameter ratio = 9.5. The title Schiff base compoun... more R factor = 0.038; wR factor = 0.107; data-to-parameter ratio = 9.5. The title Schiff base compound, C14H12ClNO, was prepared from 4-chlorobenzylamine and salicylaldehyde. The molecule is V-shaped: the dihedral angle between the aromatic rings is 67.51 (5). The rings are located on the opposite side of the C=N bond, giving an E configuration. An intramolecular N— H O hydrogen bond generates a S(6) ring. In the crystal structure, only weak non-classical C—H O contacts are observed. Related literature For background to Schiff base ligands and their biological activity, see: Adsule et al. (2006); Karthikeyan et al. (2006). For related structures, see: Tariq et al. (2010); Khalaji & Simpson (2009). For the graph-set analysis of hydrogen-bond patterns,
Journal of Saudi Chemical Society, 2021
Tetrahedron, 2020
A cyclic lipodepsipeptide, verruculin, a rosigenin and an aposphaerin analogues, verruculinone an... more A cyclic lipodepsipeptide, verruculin, a rosigenin and an aposphaerin analogues, verruculinone and 7-Omethylaposphaerin C, together with six known compounds were isolated from the marine fungus Verruculina enalia BCC 22226. The structures of these compounds were elucidated by extensive spectroscopic analysis. The absolute configuration of verruculin was determined by Marfey's method, and the relative configuration of verruculinone was obtained by X-ray crystallography. Verruculin showed weak antituberculosis and antibacterial activities, while verruculinone displayed cytotoxicity against cancer cell (MCF-7 and NCIeH187) and Vero cell lines.
Marine Drugs, 2016
Six new chamigrane sesquiterpenes, merulinols A-F (1-6), and four known metabolites (7-10) were i... more Six new chamigrane sesquiterpenes, merulinols A-F (1-6), and four known metabolites (7-10) were isolated from the culture of the basidiomycetous fungus XG8D, a mangrove-derived endophyte. Their structures were elucidated mainly by 1D and 2D NMR, while the structures of 1 and 2 were further confirmed by single-crystal X-ray diffraction analysis. The in vitro cytotoxicity of all compounds was evaluated against three human cancer cell lines, MCF-7, Hep-G2, and KATO-3. Compounds 3 and 4 selectively displayed cytotoxicity against KATO-3 cells with IC 50 values of 35.0 and 25.3 µM, respectively.