49 research outputs found
Synthesis and X-ray crystal structure of the novel organotin dication [n-Bu2Sn(H2O)4]2+: A lamellar layered structure assisted by intermolecular hydrogen bonding
No full textThe reaction of n-Bu2SnO with 2,5-dimethylbenzenesulfonic acid affords the stable monomeric tin complex [n-Bu2Sn(H2O)4]2+[2,5-Me2 -C6H3SO3]2-. The solid-state structure of the molecule reveals that the hydrogen-bonding interaction between the coordinated water and the sulfonate anion moieties leads to an unprecedented two-dimensional layered structure with a planar array of tin atoms. Further, the Lewis acidic dication complex is an extremely good catalyst for acylation of alcohols and phenols
Synthesis, Structure and Reactivity of Hydrated and Dehydrated Organotin Cations
No full textMonomeric organotin dications {[nBu2Sn(H2O)4]2+·2C6H5SO3-} and {[nBu2Sn(H2O)4]2+·1,5-C10H6(SO3-)2} have been synthesized by the reaction of [nBu2SnO]n and the corresponding arylsulfonic acid. Dodecanuclear organooxotin macrocations {[(nBuSn)12(μ 3-O)14(μ 2-OH)6]2+·2RSO3-} (R = C6H5; 2,5-Me2C6H3) have been synthesized by the reaction of nBuSn(O)(OH) and the corresponding arylsulfonic acid. The X-ray crystal structure of one of the dodecanuclear cages is reported. These organotin cations have been shown to be effective catalysts in acetylation and transacetylation reactions
N-Bonded Monosilanols: Synthesis and Characterization of ArN(SiMe3)SiMe2Cl and ArN(SiMe3)SiMe2OH (Ar = C6H5, 2,6-Me2C6H3, 2,6-iPr2C6H3)
No full textBy the use of aniline and the sterically hindered aromatic
primary amines, 2,6-Me2C6H3NH2 and 2,6-iPr2C6H3NH2, Nbonded
monochlorosilanes, ArN(SiMe3)SiMe2Cl [Ar = C6H5
(1a), Ar = 2,6-Me2C6H3 (1b) and Ar = 2,6-iPr2C6H3 (1c)] have
been prepared by a sequential deprotonation at the nitrogen
followed by reaction with silyl chlorides. Hydrolysis of the Nbonded
monochlorosilanes afforded the N-bonded monosilanols
ArN(SiMe3)SiMe2OH [Ar = C6H5 (2a), Ar = 2,6-Me2C6H3 (2b) and Ar = 2,6-iPr2C6H3 (2c)]. The X-ray crystal
structure of 1c reveals a positional disorder of the Cl and CH3
substituents on silicon. The X-ray crystal structure of 2c
shows that it is involved in an intermolecular O–H···O hydrogen
bonding in the solid state to afford a dimeric structure
containing the O2H2 ring
Solventless Reactions for the Synthesis of Organotin Clusters and Cages
No full textOrganotin clusters and cages have been synthesized in quantitative yields by using a benign solventless synthetic methodology. Using this method a variety of structural forms, which include the drum, O-capped cluster, tetranuclear oxo cage, discrete, and polymeric compounds, have been synthesized. All these compounds (1-11) have been characterized by spectroscopic and analytical techniques. The new compounds, which include the hexameric drum [n-BuSn(O)OCOAd]6 (Ad = adamantyl) 9, a triorganotin-based discrete structure Ph3SnO2C-C6-H 22,4,6-Me3 (10), and a polymer Ph3SnOSO 2-C6H3-2,5-Me2 (11), have been characterized by single-crystal X-ray crystallography
Effect of sterically hindered ligands on the solid-state structures of organosilanediols containing Si-N bonds
No full textOrganosilicon dichlorides containing Si-N bonds, RN(SiMe3){Si(Me)Cl2}, R = 2,6-i-Pr2-C6H3, 1a, and R = 2,6-Me2C6H3, 1b, serve as excellent precursors for the corresponding silanediols, RN(SiMe3){Si(Me)(OH)2}, R = 2,6-i-Pr2-C6H3, 2a, and R = 2,6-Me2C6H3, 2b. X-ray crystal structures of 1a, 2a, and 2b have been carried out. The structure of 1a represents the first example of an organosilicon dichloride containing Si-N bonds. The N-bonded silanediol 2a, which contains the sterically encumbered isopropyl groups on the aromatic amino substituent on silicon, shows the formation of two different types of hexameric hydrogen-bonded clusters in the solid state. In contrast 2b consists of cyclic hydrogen-bonded dimers linked by further intermolecular hydrogen bonding to afford an overall polymeric structure with a crinkled ribbon like arrangement
Piezoelectricity in a mixture of chiral 1D hybrid lead bromide and iodide systems
No full textChiral organic–inorganic hybrid perovskites possess inherent structural asymmetry and lattice flexibility, enabling a piezoelectric response suitable for energy harvesting and sensing technologies. Here, we introduced a new strategy for the development of a piezoelectric nanogenerator (PENG) constructed from a mixture of two chiral one-dimensional hybrid lead halides, (R-MBA)PbBr3 and (R-MBA)PbI3 (MBA: methylbenzylammonium). Individually, both hybrid halide systems exhibit piezoelectric behaviour, but when mixed, the piezoelectric output increases significantly. The highest performance is achieved for the optimized mixed halide mixture [75 wt% (R-MBA)PbBr3 + 25 wt% (R-MBA)PbI3]. To improve flexibility and mechanical endurance, we incorporated the optimized halide mixture into a polycaprolactone (PCL) polymer matrix. The device with 15 wt% of the optimized halide mixture embedded in PCL demonstrates the highest peak-to-peak voltage of 40.8 V with a power density of 83.1 μW cm-2. The halide mixture–PCL composite significantly enhances the device performance, facilitated by its endurance to a higher impact force of 21 N at 8 Hz compared to the neat mixture of hybrid halide salts without PCL (4 N at 6 Hz), leading to a 1.5 times enhancement in the peak-to-peak voltage. Finally, self-powered pressure sensors were fabricated by integrating multiple PENG devices and demonstrated for smart door mat applications. These findings show that physical mixing of chiral hybrid lead halides might be a useful approach to enhance piezoelectric performance
Effect of Sterically Hindered Ligands on the Solid-State Structures of Organosilanediols Containing Si−N Bonds<sup>§</sup>
No full textOrganosilicon dichlorides containing Si−N bonds, RN(SiMe3){Si(Me)Cl2}, R = 2,6-i-Pr2−C6H3, 1a, and R =
2,6-Me2C6H3, 1b, serve as excellent precursors for the corresponding silanediols, RN(SiMe3){Si(Me)(OH)2}, R =
2,6-i-Pr2−C6H3, 2a, and R = 2,6-Me2C6H3, 2b. X-ray crystal structures of 1a, 2a, and 2b have been carried out.
The structure of 1a represents the first example of an organosilicon dichloride containing Si−N bonds. The
N-bonded silanediol 2a, which contains the sterically encumbered isopropyl groups on the aromatic amino
substituent on silicon, shows the formation of two different types of hexameric hydrogen-bonded clusters in the
solid state. In contrast 2b consists of cyclic hydrogen-bonded dimers linked by further intermolecular hydrogen
bonding to afford an overall polymeric structure with a crinkled ribbon like arrangement
Effect of Sterically Hindered Ligands on the Solid-State Structures of Organosilanediols Containing Si−N Bonds<sup>§</sup>
No full textOrganosilicon dichlorides containing Si−N bonds, RN(SiMe3){Si(Me)Cl2}, R = 2,6-i-Pr2−C6H3, 1a, and R =
2,6-Me2C6H3, 1b, serve as excellent precursors for the corresponding silanediols, RN(SiMe3){Si(Me)(OH)2}, R =
2,6-i-Pr2−C6H3, 2a, and R = 2,6-Me2C6H3, 2b. X-ray crystal structures of 1a, 2a, and 2b have been carried out.
The structure of 1a represents the first example of an organosilicon dichloride containing Si−N bonds. The
N-bonded silanediol 2a, which contains the sterically encumbered isopropyl groups on the aromatic amino
substituent on silicon, shows the formation of two different types of hexameric hydrogen-bonded clusters in the
solid state. In contrast 2b consists of cyclic hydrogen-bonded dimers linked by further intermolecular hydrogen
bonding to afford an overall polymeric structure with a crinkled ribbon like arrangement
