X-Ray crystal structure of the complex of 15-crown-5 (1,4,7,10,13-pentaoxacyclopentadecane) with diaquatetrachlorotin(IV) at 120 K

Hough, Edward; Nicholson, D.; Vasudevan, A. K.

doi:10.1039/dt9860002335

Cited by 32 publications

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“…The lone pair of electrons present on tin may be stereochemically active 1 " 7 or inactive 8 . The lone pair of electrons present on tin may be stereochemically active 1 " 7 or inactive 8 .…”

Section: Introductionmentioning

confidence: 99%

CRYSTAL STRUCTURE AND STEREOCHEMICAL IMPLICATIONS OF THE TIN(II) LONE PAIR IN A NOVEL STERICALLY DEMANDING HETEROCYCLIC ß-DIKETONE DERIVATIVE, C25H26N4O5Sn

Jain¹,

Saxena²,

Bohra³

et al. 1995

Main Group Metal Chemistry

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The crystal structure of a tin (II) complex of composition Sn[CH 3 C0C:CON(C 6 H 5 )]^CH 3 ] 2 CH 3 OH has been determined. Crystals are monoclinic, space group P2,/c, M=581.20, a=15.441(l), b=18.503(2), c=9.152(l)Ä, ß=106.50(8), V-2507.1 Ä 3 , Z=4, Dcalc =1.540 g cnr 3 -λ(Μο-Κα) = 0.71069 Α, μ=10.62 cm 1 , T=295K, F(000) = 1176, R=0.073 for 3469 unique reflections. The central tin atom is chelated by two crystallographically equivalent heterocyclic ß-diketone ligands. A distorted trigonalbipyramidal geometry has been assigned to this complex as inferred from X-ray crystal data.

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Section: Introductionmentioning

confidence: 99%

CRYSTAL STRUCTURE AND STEREOCHEMICAL IMPLICATIONS OF THE TIN(II) LONE PAIR IN A NOVEL STERICALLY DEMANDING HETEROCYCLIC ß-DIKETONE DERIVATIVE, C25H26N4O5Sn

Jain¹,

Saxena²,

Bohra³

et al. 1995

Main Group Metal Chemistry

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“…We now wish to report the structure of fac-aqua (2-carboxyethyl-κ 2 C,O)trichloridotin(IV) 1,4,7,10,13pentaoxacyclopentadecane dihydrate, (I). Crown ether complexes of tin and organotin halides have been variously reported (Barnes & Weakley, 1976;Cusack et al, 1984;Amini et al 1984;Amini et al 2002;Russo et al, 1984;Valle et al, 1984Valle et al, , 1985Rivarola et al 1986;Hough et al, 1986;Bott et al, 1987;Cusack & Smith, 1990;Mitra et al, 1993); Yap et al, 1996;Wolff et al, 2009;Wardell et al, 2010).…”

Section: Commentmentioning

confidence: 99%

Bis[2-(cyclopropyliminomethyl)-5-methoxyphenolato]zinc(II)

Bai¹

2010

Acta Cryst E

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“…With regard to the deficit of antimony, it is intriguing to consider that the ionic diameter of Sb 3ϩ ͑1. 24,25 Thus, the change in GaSb surface stoichiometry may result from the preferential complexation ͑and subsequent dissolution͒ of Sb cations by excess 15-crown-5.…”

Section: Fig 1 Ga 2 P3mentioning

confidence: 99%

A comparative study of GaSb (100) surface passivation by aqueous and nonaqueous solutions

Liu

Kuech

Saulys

2003

Applied Physics Letters

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We report a nonaqueous passivation regime consisting of Na 2 S/benzene/15-crown-5/oxidant. The use of a nonpolar, aprotic organic medium required the addition of a specific chelating agent ͑15-crown-5͒ to solubilize sodium sulfide, and organic oxidizing agents ͑anthraquinone, benzophenone, etc.͒ to act as electron acceptors. The surface optical and chemical properties of GaSb surfaces after aqueous and nonaqueous sulfide treatments were compared. Nonaqueous passivation resulted in higher photoluminescence ͑PL͒ intensity, lower oxide content, and a less amount of elemental Sb than aqueous passivation. The PL intensity from passivated surfaces was correlated with the standard reduction potentials of electron acceptors. © 2003 American Institute of Physics. ͓DOI: 10.1063/1.1613994͔The surface properties of semiconductors are crucial determinants of device performance. Considerable efforts have been made to modify III-V semiconductor surfaces in order to improve electronic properties and device performance. The passivation of GaAs with aqueous solutions of sodium or ammonium sulfides has been extensively studied both theoretically and experimentally. [1][2][3][4] The reactions between chalcogenides and GaAs surface species change the surface electronic structures and remove the surface states from the band gap, thus unpinning the surface Fermi level and improving electrical and optical properties.GaSb is an important III-V compound semiconductor for high-speed and optoelectronic device applications, the performance of which is strongly dependent on the chemical and electronic properties of GaSb surfaces or interfaces. However, GaSb is highly chemically reactive, being easily oxidized by atmospheric oxygen with the formation of native surface oxides several nanometers thick.5 An additional consequence of surface oxidation is the formation of elemental antimony at the oxide-GaSb interface, which creates a conduction channel parallel to the interface that leads to high surface leakage current, thus limiting applications.6,7 Various surface passivation methods, including wet and dry chemical processes, [8][9][10][11] have been studied in efforts to improve GaSb surface characteristics. Unfortunately, most processing techniques are still water-based and lead to the growth of surface oxides and degrade the structural quality of the surface. Therefore, alternative, nonaqueous, solvents capable of sulfidization are of particular interest for GaSb surface processing.In this work, a specific benzene-based sodium sulfide passivation regime was developed to improve the passivation of GaSb surfaces. Chelating agents were employed to solubilize and activate sulfide anions, and organic oxidizing agents were added to the passivation solution to facilitate electron transfer. The optical and chemical characteristics, before and after chemical treatments, were studied by photoluminescence ͑PL͒ and x-ray photoemission spectroscopy ͑XPS͒. A comparison of the results of GaSb passivation in aqueous and nonaqueous sulfide solutions indicat...

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X-Ray crystal structure of the complex of 15-crown-5 (1,4,7,10,13-pentaoxacyclopentadecane) with diaquatetrachlorotin(IV) at 120 K

Cited by 32 publications

References 0 publications

CRYSTAL STRUCTURE AND STEREOCHEMICAL IMPLICATIONS OF THE TIN(II) LONE PAIR IN A NOVEL STERICALLY DEMANDING HETEROCYCLIC ß-DIKETONE DERIVATIVE, C25H26N4O5Sn

CRYSTAL STRUCTURE AND STEREOCHEMICAL IMPLICATIONS OF THE TIN(II) LONE PAIR IN A NOVEL STERICALLY DEMANDING HETEROCYCLIC ß-DIKETONE DERIVATIVE, C25H26N4O5Sn

Bis[2-(cyclopropyliminomethyl)-5-methoxyphenolato]zinc(II)

A comparative study of GaSb (100) surface passivation by aqueous and nonaqueous solutions

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