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Papers by Thanawat Chaiprasert

Research paper thumbnail of Fluorescent Janus ring siloxanes for detection of Au(III) and l-cysteine

Research paper thumbnail of CCDC 2036877: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 2036879: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 2036878: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 2036880: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 2021984: Experimental Crystal Structure Determination

Research paper thumbnail of Well-defined cyclic silanol derivatives

Dalton Transactions, 2022

Cyclic silanol derivatives (CSDs), possessing siloxane rings consisting of T-unit silicon and oxy... more Cyclic silanol derivatives (CSDs), possessing siloxane rings consisting of T-unit silicon and oxygen atoms, are considered efficient precursors for the preparation of function materials in various application fields.

Research paper thumbnail of CCDC 915297: Experimental Crystal Structure Determination

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.

Research paper thumbnail of CCDC 915240: Experimental Crystal Structure Determination

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.

Research paper thumbnail of Synthesis of Tricyclic Laddersiloxane with Various Ring Sizes (Bat Siloxane)

Macromolecular Rapid Communications, 2020

Research paper thumbnail of Vinyl-Functionalized Janus Ring Siloxane: Potential Precursors to Hybrid Functional Materials

Materials, 2021

A vinyl-functionalized all-cis-tetrasiloxycyclotetrasiloxane [ViSi(OSiMe2H)O]4 (Vi = vinyl group)... more A vinyl-functionalized all-cis-tetrasiloxycyclotetrasiloxane [ViSi(OSiMe2H)O]4 (Vi = vinyl group) Janus precursor was prepared from potassium cyclotetrasiloxane silanolate. The Janus precursor was selectively modified at its dimethylhydrosilyl groups [–SiMe2H] via the Piers–Rubinsztajn reaction to obtain a family of new tetravinyl-substituted Janus rings [ViSi(OR’)O]4 containing various functional groups in moderate yields. Remarkably, the tetravinyl groups on the structure remained intact after modification by the Piers–Rubinsztajn reaction. Since these synthesized compounds possess multiple functional groups (up to eight per molecule), they are potential precursors for advanced hybrid organic-inorganic functional materials.

Research paper thumbnail of Janus ring siloxane: a versatile precursor of the extended Janus ring and tricyclic laddersiloxanes

Dalton Transactions, 2020

All-cis-tetrasiloxycyclotetrasiloxanes (Janus ring siloxanes) were facilely prepared from all-cis... more All-cis-tetrasiloxycyclotetrasiloxanes (Janus ring siloxanes) were facilely prepared from all-cis-cyclotetrasiloxanetetraol or sodium cyclotetrasiloxane silanolates.

Research paper thumbnail of Tunable Porosity of Cross-Linked-Polyhedral Oligomeric Silsesquioxane Supports for Palladium-Catalyzed Aerobic Alcohol Oxidation in Water

ACS Applied Materials & Interfaces, 2017

Polyhedral oligomeric silsesquioxane (POSS)-based materials, poly-POSS-T n [n = 8 (1), 10 (2), 12... more Polyhedral oligomeric silsesquioxane (POSS)-based materials, poly-POSS-T n [n = 8 (1), 10 (2), 12 (3), and mix (4)], were prepared in high yields via free radical polymerization of corresponding pure forms of methacrylate-functionalized POSS monomers, MMA-POSS-T n (n = 8, 10, 12), and the mixture form, MMA-POSS-T mix. Powder X-ray diffraction (XRD) spectra and BET analysis indicate that 1-4 are amorphous materials with high surface areas (683-839 m 2 •g-1). The surface areas and total pore volumes follow the trend: poly-POSS-T 12 > poly-POSS-T 10 > poly-POSS-T mix > poly-POSS-T 8. In addition, based on Barrett-Joyner-Halenda (BJH) analysis, poly-POSS-T 12 contains the highest amount of mesopores. The Pd nanoparticles immobilized on poly-POSS-T n [n = 8 (5), 10 (6), 12 (7), and mix (8)] are well dispersed with 4-6 wt% Pd content and similar average particle size of 6.2-6.5 nm, according to transmission electron microscopy-energy dispersive X-ray analysis (TEM-EDX) and microwave plasma-atomic emission spectroscopy (MP-AES). At 90 o C, the stabilized Pd nanoparticles in 5-8 catalyzed aerobic oxidation of benzyl alcohol to benzaldehyde in 72-100% yields at 6 h using a mixture of a H 2 O/Pluronic (P123) solution. The PdNp@poly-POSS-T 8 catalyst (5) exhibited the lowest catalytic activity, as a result of its lowest surface areas, total pore volumes, and amounts of mesopores. With the catalyst 8, various benzyl alcohol derivatives were converted to the corresponding aldehydes in good to excellent yields. However, with alcoholic substrates featuring electron-withdrawing substituents, high conversions were achieved with one equivalent of K 2 CO 3 additive and longer reaction times.

Research paper thumbnail of Solid-state Synthesis of Polyhedral Oligomeric Silsesquioxane-Supported N-Heterocyclic Carbenes/Imidazolium salts on Palladium Nanoparticles: Highly Active and Recyclable Catalyst

ChemistrySelect, 2016

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 silsesquioxanesupported 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 AE 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 À1 .

Research paper thumbnail of Air-stable imidazole-imine palladium complexes for Suzuki–Miyaura coupling: Toward an efficient, green synthesis of biaryl compounds

Journal of Organometallic Chemistry, 2014

New imidazole-imine ligands have been developed for the air and moisture stable Pd-catalyzed Suzu... more New imidazole-imine ligands have been developed for the air and moisture stable Pd-catalyzed Suzuki eMiyaura cross-coupling reaction. Under optimized reaction conditions, coupling products from a wide range of aryl halides and aryl boronic acids were obtained in excellent yields.

Research paper thumbnail of Fluorescent Janus ring siloxanes for detection of Au(III) and l-cysteine

Research paper thumbnail of CCDC 2036877: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 2036879: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 2036878: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 2036880: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 2021984: Experimental Crystal Structure Determination

Research paper thumbnail of Well-defined cyclic silanol derivatives

Dalton Transactions, 2022

Cyclic silanol derivatives (CSDs), possessing siloxane rings consisting of T-unit silicon and oxy... more Cyclic silanol derivatives (CSDs), possessing siloxane rings consisting of T-unit silicon and oxygen atoms, are considered efficient precursors for the preparation of function materials in various application fields.

Research paper thumbnail of CCDC 915297: Experimental Crystal Structure Determination

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.

Research paper thumbnail of CCDC 915240: Experimental Crystal Structure Determination

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.

Research paper thumbnail of Synthesis of Tricyclic Laddersiloxane with Various Ring Sizes (Bat Siloxane)

Macromolecular Rapid Communications, 2020

Research paper thumbnail of Vinyl-Functionalized Janus Ring Siloxane: Potential Precursors to Hybrid Functional Materials

Materials, 2021

A vinyl-functionalized all-cis-tetrasiloxycyclotetrasiloxane [ViSi(OSiMe2H)O]4 (Vi = vinyl group)... more A vinyl-functionalized all-cis-tetrasiloxycyclotetrasiloxane [ViSi(OSiMe2H)O]4 (Vi = vinyl group) Janus precursor was prepared from potassium cyclotetrasiloxane silanolate. The Janus precursor was selectively modified at its dimethylhydrosilyl groups [–SiMe2H] via the Piers–Rubinsztajn reaction to obtain a family of new tetravinyl-substituted Janus rings [ViSi(OR’)O]4 containing various functional groups in moderate yields. Remarkably, the tetravinyl groups on the structure remained intact after modification by the Piers–Rubinsztajn reaction. Since these synthesized compounds possess multiple functional groups (up to eight per molecule), they are potential precursors for advanced hybrid organic-inorganic functional materials.

Research paper thumbnail of Janus ring siloxane: a versatile precursor of the extended Janus ring and tricyclic laddersiloxanes

Dalton Transactions, 2020

All-cis-tetrasiloxycyclotetrasiloxanes (Janus ring siloxanes) were facilely prepared from all-cis... more All-cis-tetrasiloxycyclotetrasiloxanes (Janus ring siloxanes) were facilely prepared from all-cis-cyclotetrasiloxanetetraol or sodium cyclotetrasiloxane silanolates.

Research paper thumbnail of Tunable Porosity of Cross-Linked-Polyhedral Oligomeric Silsesquioxane Supports for Palladium-Catalyzed Aerobic Alcohol Oxidation in Water

ACS Applied Materials & Interfaces, 2017

Polyhedral oligomeric silsesquioxane (POSS)-based materials, poly-POSS-T n [n = 8 (1), 10 (2), 12... more Polyhedral oligomeric silsesquioxane (POSS)-based materials, poly-POSS-T n [n = 8 (1), 10 (2), 12 (3), and mix (4)], were prepared in high yields via free radical polymerization of corresponding pure forms of methacrylate-functionalized POSS monomers, MMA-POSS-T n (n = 8, 10, 12), and the mixture form, MMA-POSS-T mix. Powder X-ray diffraction (XRD) spectra and BET analysis indicate that 1-4 are amorphous materials with high surface areas (683-839 m 2 •g-1). The surface areas and total pore volumes follow the trend: poly-POSS-T 12 > poly-POSS-T 10 > poly-POSS-T mix > poly-POSS-T 8. In addition, based on Barrett-Joyner-Halenda (BJH) analysis, poly-POSS-T 12 contains the highest amount of mesopores. The Pd nanoparticles immobilized on poly-POSS-T n [n = 8 (5), 10 (6), 12 (7), and mix (8)] are well dispersed with 4-6 wt% Pd content and similar average particle size of 6.2-6.5 nm, according to transmission electron microscopy-energy dispersive X-ray analysis (TEM-EDX) and microwave plasma-atomic emission spectroscopy (MP-AES). At 90 o C, the stabilized Pd nanoparticles in 5-8 catalyzed aerobic oxidation of benzyl alcohol to benzaldehyde in 72-100% yields at 6 h using a mixture of a H 2 O/Pluronic (P123) solution. The PdNp@poly-POSS-T 8 catalyst (5) exhibited the lowest catalytic activity, as a result of its lowest surface areas, total pore volumes, and amounts of mesopores. With the catalyst 8, various benzyl alcohol derivatives were converted to the corresponding aldehydes in good to excellent yields. However, with alcoholic substrates featuring electron-withdrawing substituents, high conversions were achieved with one equivalent of K 2 CO 3 additive and longer reaction times.

Research paper thumbnail of Solid-state Synthesis of Polyhedral Oligomeric Silsesquioxane-Supported N-Heterocyclic Carbenes/Imidazolium salts on Palladium Nanoparticles: Highly Active and Recyclable Catalyst

ChemistrySelect, 2016

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 silsesquioxanesupported 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 AE 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 À1 .

Research paper thumbnail of Air-stable imidazole-imine palladium complexes for Suzuki–Miyaura coupling: Toward an efficient, green synthesis of biaryl compounds

Journal of Organometallic Chemistry, 2014

New imidazole-imine ligands have been developed for the air and moisture stable Pd-catalyzed Suzu... more New imidazole-imine ligands have been developed for the air and moisture stable Pd-catalyzed Suzuki eMiyaura cross-coupling reaction. Under optimized reaction conditions, coupling products from a wide range of aryl halides and aryl boronic acids were obtained in excellent yields.