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.
A new synthetic method for tricyclic laddersiloxanes, ladder-type silsesquioxanes with defined st... more A new synthetic method for tricyclic laddersiloxanes, ladder-type silsesquioxanes with defined structures, is developed based on intramolecular cyclization of hydrosilyl-functionalized cyclic siloxanes. This method enables the construction of unprecedented laddersiloxanes with various ring sizes. Herein, the preparation of tricyclic laddersiloxanes containing 6-8-6-, 8-8-8-, or 12-8-12-membered-ring systems is reported. These products can be considered as bat-shape siloxanes, owing to their rigid inorganic siloxane body with flexible oligosiloxane "wings" as side rings. The synthesized compounds are potential building blocks for well-defined nanomaterials, porous materials, and host molecules.
The one-pot synthesis of an unsymmetrical double-decker siloxane with a novel structure via the r... more The one-pot synthesis of an unsymmetrical double-decker siloxane with a novel structure via the reaction of double-decker tetrasodiumsilanolate with 1 equiv. of dichlorotetraphenyldisiloxane in the presence of an acid is reported herein for the first time. The target compound bearing all phenyl substituents on the unsymmetrical siloxane structure was successfully obtained, as confirmed by 1H-NMR, 13C-NMR, 29Si-NMR, IR, MALDI-TOF, and X-ray crystallography analyses. Additionally, the thermal properties of the product were evaluated by TG/DTA and compared with those of other siloxane cage compounds.
Novel polyhedral structures were prepared with a butterfly-shape comprised of oligosiloxane wings... more Novel polyhedral structures were prepared with a butterfly-shape comprised of oligosiloxane wings and a double- decker silsesquioxane (DDSQ) body. The compounds were synthesized in two steps from commercially available alkoxysilanes, and their structures were confirmed using spectroscopic methods and X-ray crystallography. Not like other phenyl-substituted cage silsesquioxanes, these butterfly cages show very good solubility in common organic solvents. The crystal structures clearly showed their unique features: a larger space with longer siloxane chains, and very flexible framework. Moreover, these compounds are thermally stable with a Td 5 (5% weight loss temperature) over 320 °C.
Journal of Photochemistry and Photobiology A: Chemistry, 2018
Abstract Polyhedral oligomeric silsesquioxane (POSS) was ultilized as a core and functionalized w... more Abstract Polyhedral oligomeric silsesquioxane (POSS) was ultilized as a core and functionalized with the rhodamine hydrazide receptors for incresing the sensitivity of Hg2+ sensing. The POSS sensor (T10Rh) was synthesised, and its sensing behaviors toward metal ions were investigated by UV/Vis and fluorescence spectroscopy. The sensor provided chromogenic and fluorogenic changes upon Hg2+ detection as well as served as a “naked-eye” indicator by a noticeable color change of the aqueous solutions (from colorless to pink-red color). The selective binding resulted in the change in the structures from the spirolactams (non-fluorescent forms) to the non-cyclic forms (fluorescent forms) of T10Rh as indicated by the OFF-ON fluorescence signal upon Hg2+ binding and was shown to discriminate Cu2+, Ag+, Pb2+, Al3+, Cd2+, Mg2+, Ni2+, Fe2+, Co2+, Mn2+, Zn2+, Li+, Na+, Ba2+, Ca2+ and K+, with ultra detection limit of 0.63 ppb which was lower than drinking water permission concentrations by the United States Environmental Protection Agency (U.S. EPA) and World Health Organization (WHO).
Well-defined Mg(OH)2 (brucite) hexagonal platy particle with the lateral size of 80 nm was prepar... more Well-defined Mg(OH)2 (brucite) hexagonal platy particle with the lateral size of 80 nm was prepared by the precipitation from aqueous solution of magnesium chloride using the flow reactor with the ...
Journal of Photochemistry and Photobiology A: Chemistry, 2018
Polyhedral oligomeric silsesquioxane (POSS) was ultilized as a core and functionalized with the r... more Polyhedral oligomeric silsesquioxane (POSS) was ultilized as a core and functionalized with the rhodamine hydrazide receptors for incresing the sensitivity of Hg2+ sensing. The POSS sensor (T10Rh) was synthesised, and its sensing behaviors toward metal ions were investigated by UV/Vis and fluorescence spectroscopy. The sensor provided chromogenic and fluorogenic changes upon Hg2+ detection as well as served as a “naked-eye” indicator by a noticeable color change of the aqueous solutions (from colorless to pink-red color). The selective binding resulted in the change in the structures from the spirolactams (non-fluorescent forms) to the non-cyclic forms (fluorescent forms) of T10Rh as indicated by the OFF-ON fluorescence signal upon Hg2+ binding and was shown to discriminate Cu2+, Ag+, Pb2+, Al3+, Cd2+, Mg2+, Ni2+, Fe2+, Co2+, Mn2+, Zn2+, Li+, Na+, Ba2+, Ca2+ and K+, with ultra detection limit of 0.63 ppb which was lower than drinking water permission concentrations by the United States Environmental Protection Agency (U.S. EPA) and World Health Organization (WHO).
A novel synthetic method for the construction of a double-decker silsesquioxane from fluorosilane... more A novel synthetic method for the construction of a double-decker silsesquioxane from fluorosilanes was developed. Phenyl-substituted double-decker silsesquioxane was prepared under mild conditions by coupling difluorodiphenylsilane and a tetrasiloxanolate precursor. A similar reaction was performed using difluorovinylsilane, and a divinyl double-decker silsesquioxane was obtained. The one-step reaction of a functional difluorosilane containing an aminopropyl group afforded a novel double-decker silsesquioxane with two amino groups complexed with BF3, which can react with carboxylic acid anhydrides to afford an amide product. This synthetic method using difluorosilane is tolerant of a wide range of functional groups and is applicable to the synthesis of polycyclic silsesquioxanes bearing amino groups, which are difficult to directly obtain from dichlorosilane.
Abstract Organic-inorganic hybrid nano-building block of polyhedral oligomeric silsesquioxane (PO... more Abstract Organic-inorganic hybrid nano-building block of polyhedral oligomeric silsesquioxane (POSS) containing hyperbranched sulfonic acid groups was easily prepared within a day through oxidation reaction at room temperature. The desired product was fully characterized by 1 H, 13 C{ 1 H} NMR, 29 Si CP/MAS NMR, FT-IR spectroscopy, and TGA-DSC analysis, confirming the complete formation of sulphonic acids while retaining the cubic structure of silsesquioxanes cage. Furthermore, the proton exchange capacities of POSS catalyst were determined to be 5.39 meq of H + /g, much greater than any previous silicon-based materials, leading to the catalytic preparation of polycaprolactone with well-controlled polymerization under the metal-free system and without the addition of any co-catalysts and solvents.
We describe a novel and green synthetic methodology for the fabrication of polyhedral oligomeric ... more We describe a novel and green synthetic methodology for the fabrication of polyhedral oligomeric silsesquioxane‐supported N‐heterocyclic carbenes/imidazolium salts on palladium(II) complexes; Pd(II)‐MPIm‐POSS (1) composite by solid‐state annealing between Pd(OAc)2 and octakis(3‐(1‐methylimidazolium)propyl) octasilsesquioxane without added base. Subsequently, arylboronic acid based in situ or ex situ reduction of 1 in aqueous ethanol produces polyhedral oligomeric silsesquioxane‐supported N‐heterocyclic carbenes/imidazolium salts on palladium nanoparticles; Pd(0)‐nano‐POSS (2) composite, consisting of monodispersed and N‐heterocyclic carbene (NHC) stabilized Pd nanoparticles of very small size (3.0 ± 1.5 nm). Nanocatalyst 2 is a highly efficient and easily recyclable homogeneous catalyst for Suzuki‐Miyaura cross‐coupling reactions with TOF up to 1670 h−1.
Organic-inorganic hybrid nano-building blocks of aromatic nitro-, aldehyde-, and bromo-functional... more Organic-inorganic hybrid nano-building blocks of aromatic nitro-, aldehyde-, and bromo-functionalized polyhedral oligomeric silsesquioxanes were easily prepared through nucleophilic substitutions, starting from the reactions between octakis(3-chloropropyl)octasilsesquioxane and phenoxide derivatives. These phenoxide anions not only supply the substitution functions to a silsesquioxane cage, but can also induce a cage-rearrangement leading to the formation of octa-, deca-, and dodecahedral silsesquioxane cages.
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.
A new synthetic method for tricyclic laddersiloxanes, ladder-type silsesquioxanes with defined st... more A new synthetic method for tricyclic laddersiloxanes, ladder-type silsesquioxanes with defined structures, is developed based on intramolecular cyclization of hydrosilyl-functionalized cyclic siloxanes. This method enables the construction of unprecedented laddersiloxanes with various ring sizes. Herein, the preparation of tricyclic laddersiloxanes containing 6-8-6-, 8-8-8-, or 12-8-12-membered-ring systems is reported. These products can be considered as bat-shape siloxanes, owing to their rigid inorganic siloxane body with flexible oligosiloxane "wings" as side rings. The synthesized compounds are potential building blocks for well-defined nanomaterials, porous materials, and host molecules.
The one-pot synthesis of an unsymmetrical double-decker siloxane with a novel structure via the r... more The one-pot synthesis of an unsymmetrical double-decker siloxane with a novel structure via the reaction of double-decker tetrasodiumsilanolate with 1 equiv. of dichlorotetraphenyldisiloxane in the presence of an acid is reported herein for the first time. The target compound bearing all phenyl substituents on the unsymmetrical siloxane structure was successfully obtained, as confirmed by 1H-NMR, 13C-NMR, 29Si-NMR, IR, MALDI-TOF, and X-ray crystallography analyses. Additionally, the thermal properties of the product were evaluated by TG/DTA and compared with those of other siloxane cage compounds.
Novel polyhedral structures were prepared with a butterfly-shape comprised of oligosiloxane wings... more Novel polyhedral structures were prepared with a butterfly-shape comprised of oligosiloxane wings and a double- decker silsesquioxane (DDSQ) body. The compounds were synthesized in two steps from commercially available alkoxysilanes, and their structures were confirmed using spectroscopic methods and X-ray crystallography. Not like other phenyl-substituted cage silsesquioxanes, these butterfly cages show very good solubility in common organic solvents. The crystal structures clearly showed their unique features: a larger space with longer siloxane chains, and very flexible framework. Moreover, these compounds are thermally stable with a Td 5 (5% weight loss temperature) over 320 °C.
Journal of Photochemistry and Photobiology A: Chemistry, 2018
Abstract Polyhedral oligomeric silsesquioxane (POSS) was ultilized as a core and functionalized w... more Abstract Polyhedral oligomeric silsesquioxane (POSS) was ultilized as a core and functionalized with the rhodamine hydrazide receptors for incresing the sensitivity of Hg2+ sensing. The POSS sensor (T10Rh) was synthesised, and its sensing behaviors toward metal ions were investigated by UV/Vis and fluorescence spectroscopy. The sensor provided chromogenic and fluorogenic changes upon Hg2+ detection as well as served as a “naked-eye” indicator by a noticeable color change of the aqueous solutions (from colorless to pink-red color). The selective binding resulted in the change in the structures from the spirolactams (non-fluorescent forms) to the non-cyclic forms (fluorescent forms) of T10Rh as indicated by the OFF-ON fluorescence signal upon Hg2+ binding and was shown to discriminate Cu2+, Ag+, Pb2+, Al3+, Cd2+, Mg2+, Ni2+, Fe2+, Co2+, Mn2+, Zn2+, Li+, Na+, Ba2+, Ca2+ and K+, with ultra detection limit of 0.63 ppb which was lower than drinking water permission concentrations by the United States Environmental Protection Agency (U.S. EPA) and World Health Organization (WHO).
Well-defined Mg(OH)2 (brucite) hexagonal platy particle with the lateral size of 80 nm was prepar... more Well-defined Mg(OH)2 (brucite) hexagonal platy particle with the lateral size of 80 nm was prepared by the precipitation from aqueous solution of magnesium chloride using the flow reactor with the ...
Journal of Photochemistry and Photobiology A: Chemistry, 2018
Polyhedral oligomeric silsesquioxane (POSS) was ultilized as a core and functionalized with the r... more Polyhedral oligomeric silsesquioxane (POSS) was ultilized as a core and functionalized with the rhodamine hydrazide receptors for incresing the sensitivity of Hg2+ sensing. The POSS sensor (T10Rh) was synthesised, and its sensing behaviors toward metal ions were investigated by UV/Vis and fluorescence spectroscopy. The sensor provided chromogenic and fluorogenic changes upon Hg2+ detection as well as served as a “naked-eye” indicator by a noticeable color change of the aqueous solutions (from colorless to pink-red color). The selective binding resulted in the change in the structures from the spirolactams (non-fluorescent forms) to the non-cyclic forms (fluorescent forms) of T10Rh as indicated by the OFF-ON fluorescence signal upon Hg2+ binding and was shown to discriminate Cu2+, Ag+, Pb2+, Al3+, Cd2+, Mg2+, Ni2+, Fe2+, Co2+, Mn2+, Zn2+, Li+, Na+, Ba2+, Ca2+ and K+, with ultra detection limit of 0.63 ppb which was lower than drinking water permission concentrations by the United States Environmental Protection Agency (U.S. EPA) and World Health Organization (WHO).
A novel synthetic method for the construction of a double-decker silsesquioxane from fluorosilane... more A novel synthetic method for the construction of a double-decker silsesquioxane from fluorosilanes was developed. Phenyl-substituted double-decker silsesquioxane was prepared under mild conditions by coupling difluorodiphenylsilane and a tetrasiloxanolate precursor. A similar reaction was performed using difluorovinylsilane, and a divinyl double-decker silsesquioxane was obtained. The one-step reaction of a functional difluorosilane containing an aminopropyl group afforded a novel double-decker silsesquioxane with two amino groups complexed with BF3, which can react with carboxylic acid anhydrides to afford an amide product. This synthetic method using difluorosilane is tolerant of a wide range of functional groups and is applicable to the synthesis of polycyclic silsesquioxanes bearing amino groups, which are difficult to directly obtain from dichlorosilane.
Abstract Organic-inorganic hybrid nano-building block of polyhedral oligomeric silsesquioxane (PO... more Abstract Organic-inorganic hybrid nano-building block of polyhedral oligomeric silsesquioxane (POSS) containing hyperbranched sulfonic acid groups was easily prepared within a day through oxidation reaction at room temperature. The desired product was fully characterized by 1 H, 13 C{ 1 H} NMR, 29 Si CP/MAS NMR, FT-IR spectroscopy, and TGA-DSC analysis, confirming the complete formation of sulphonic acids while retaining the cubic structure of silsesquioxanes cage. Furthermore, the proton exchange capacities of POSS catalyst were determined to be 5.39 meq of H + /g, much greater than any previous silicon-based materials, leading to the catalytic preparation of polycaprolactone with well-controlled polymerization under the metal-free system and without the addition of any co-catalysts and solvents.
We describe a novel and green synthetic methodology for the fabrication of polyhedral oligomeric ... more We describe a novel and green synthetic methodology for the fabrication of polyhedral oligomeric silsesquioxane‐supported N‐heterocyclic carbenes/imidazolium salts on palladium(II) complexes; Pd(II)‐MPIm‐POSS (1) composite by solid‐state annealing between Pd(OAc)2 and octakis(3‐(1‐methylimidazolium)propyl) octasilsesquioxane without added base. Subsequently, arylboronic acid based in situ or ex situ reduction of 1 in aqueous ethanol produces polyhedral oligomeric silsesquioxane‐supported N‐heterocyclic carbenes/imidazolium salts on palladium nanoparticles; Pd(0)‐nano‐POSS (2) composite, consisting of monodispersed and N‐heterocyclic carbene (NHC) stabilized Pd nanoparticles of very small size (3.0 ± 1.5 nm). Nanocatalyst 2 is a highly efficient and easily recyclable homogeneous catalyst for Suzuki‐Miyaura cross‐coupling reactions with TOF up to 1670 h−1.
Organic-inorganic hybrid nano-building blocks of aromatic nitro-, aldehyde-, and bromo-functional... more Organic-inorganic hybrid nano-building blocks of aromatic nitro-, aldehyde-, and bromo-functionalized polyhedral oligomeric silsesquioxanes were easily prepared through nucleophilic substitutions, starting from the reactions between octakis(3-chloropropyl)octasilsesquioxane and phenoxide derivatives. These phenoxide anions not only supply the substitution functions to a silsesquioxane cage, but can also induce a cage-rearrangement leading to the formation of octa-, deca-, and dodecahedral silsesquioxane cages.
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Papers by Rungthip Kunthom