Sn-S Bonds Research Articles

Hydrothermally derived Cr-doped SnS2 layered nanoplates: investigation of their controlled structural, morphological, optical, magnetic, photo response and photocatalytic activities

A facile method has been employed to synthesize pristine and Cr-doped SnS2 (Cr: SnS2) nanoplates (Sn1-xCrxS2, here x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) and Cr: SnS2 nanoplates (NPs) were successfully synthesized via hydrothermal method. The nanoplates' structure was hexagonal, with a preference for orientation along the (001) plane; there was no evidence of additional undesirable phases. FTIR and EDX were used to observe the existence of functional groups in the samples where Sn-S bonds were present in each of the produced pristine and Cr: SnS2 nanoplates. XPS measurements demonstrated the existence of Sn, S, and Cr. FESEM revealed that the morphological properties of the nanoplates included several hexagonal grains. Magnetic characterizations showed that with increasing doping concentration of Cr, SnS2 nanoplates become superparamagnetic from ferromagnetic. The band gap values for the pristine and Cr: SnS2 nanoplates calculated from the absorbance spectra decreased from 2.53 to 2.08 eV with an increase in doping concentration. The photoluminescence spectra of the pristine SnS2 and Cr: SnS2 nanoplates exhibit two strong emission peaks at around 562 and 666 nm for an excitation wavelength of 420 nm. The Cr: SnS2 nanoplates have demonstrated the resistive behavior of the sample. The Cr: SnS2 nanoplates have shown good photocatalytic activity towards the decolorization of rhodamine B under visible irradiation.

Soft-in-Rigid Strategy Promoting Rapid and High-Capacity Lithium Storage by Chemical Scissoring.

Large and rapid lithium storage is hugely demanded for high-energy/power lithium-ion batteries; however, it is difficult to achieve these two indicators simultaneously. Sn-based materials with a (de)alloying mechanism show low working potential and high theoretical capacity, but the huge volume expansion and particle agglomeration of Sn restrict cyclic stability and rate capability. Herein, a soft-in-rigid concept was proposed and achieved by chemical scissoring where a soft Sn-S bond was chosen as chemical tailor to break the Ti-S bond to obtain a loose stacking structure of 1D chain-like Sn1.2Ti0.8S3. The in situ and ex situ (micro)structural characterizations demonstrate that the Sn-S bonds are reduced into Sn domains and such Sn disperses in the rigid Ti-S framework, thus relieving the volume expansion and particle agglomeration by chemical and physical shielding. Benefiting from the merits of large-capacity Sn with an alloying mechanism and high-rate TiS2 with an intercalation mechanism, the Sn1.2Ti0.8S3 anode offers a high specific capacity of 963.2 mA h g-1 at 0.1 A g-1 after 100 cycles and a reversible capacity of 250 mA h g-1 at 10 A g-1 after 3900 cycles. Such a strategy realized by chemical tailoring at the structural unit level would broaden the prospects for constructing joint high-capacity and high-rate LIB anodes.

Are Selenides the Same as Sulfides? Structure, Spectroscopy, and Properties of Narrow-Gap Rare-Earth Semiconductors RE2Sn(S1-xSex)5 (RE = La, Ce; x = 0-0.8).

The ternary rare-earth sulfides RE2SnS5 (RE = La-Nd) and the partial solid solutions RE2Sn(S1-xSex)5 (RE = La, Ce; x = 0-0.8) were prepared in the form of polycrystalline samples by reaction of the elements at 900 °C and as single crystals in the presence of KBr flux. They adopt the La2SnS5-type structure (orthorhombic, space group Pbam, Z = 2) consisting of chains of edge-sharing SnCh6 octahedra separated by RE atoms. Although the cell parameters evolve smoothly in RE2Sn(S1-xSex)5, detailed structural analysis by single-crystal X-ray diffraction revealed a pronounced preference for the Se atoms to occupy two out of the three chalcogen sites, which offers a rationalization for why the all-selenide end-members RE2SnSe5 do not form. Solid-state 119Sn NMR spectra confirmed the nonrandom distribution of SnS6-nSen local environments, which could be resolved into individual resonances. The Raman spectra of RE2SnS5 compounds show an intense peak at 307-320 cm-1 assigned to a symmetric A1g mode, which is dominated by Sn-S bonds; the Raman peak intensities varied with Se substitution in La2Sn(S1-xSex)5. Optical diffuse reflectance spectra, band structure calculations, and electrochemical impedance spectra indicated that these compounds are narrow band gap semiconductors; the optical band gaps are insensitive to RE substitution in RE2SnS5 (0.7 eV) but they gradually decrease with greater Se substitution in RE2Sn(S1-xSex)5 (0.7-0.4 eV).

Monosubstituted Doublet Sn(I) Radical Featuring Substantial Unquenched Orbital Angular Momentum

Due to their intrinsic high reactivity, isolation of heavier analogues of carbynes remains a great challenge. Here, we report the synthesis and characterization of a neutral monosubstituted Sn(I) radical (2) supported by a sterically hindered hydrindacene ligand, which represents the first tin analogue of a free carbyne. Different from all Sn(I/III) species reported thus far, the presence of a sole Sn-C σ bond in 2 renders the remaining two Sn 5p orbitals energetically almost degenerate, of which one is singly occupied and the other is empty. Consequently, its S = 1/2 ground state possesses two-fold orbital pseudo-degeneracy and substantial unquenched orbital angular momentum, as evidenced by one component of its g matrix (1.957, 1.896, and 1.578) being considerably less than 2. Consistent with this unique electronic structure, 2 can bind to an N-heterocyclic carbene to afford a neutral two-coordinate Sn(I) radical and initiate a one-electron transfer to benzophenone to furnish a Sn(II)-ketyl radical anion adduct. As a manifestation of its Sn-centered radical nature, 2 reacts with diphenyl diselenide and p-benzoquinone to form Sn-S and Sn-O bonds, respectively.

Strongly Coupled Tin(IV) Sulfide–MultiWalled Carbon Nanotube Hybrid Composites and Their Enhanced Thermoelectric Properties

Herein, tin(IV) sulfide (SnS2) and multiwalled carbon nanotube (MWCNT) composites are fabricated via a simple solution-mixing method in a hydrothermal reactor. SnS2 is closely coupled to the MWCNT surface, thus forming a coaxial nanostructure. Examination by X-ray photoelectron spectroscopy and scanning transmission electron microscopy indicates that the strong interface between SnS2 and the MWCNTs in the composite material is due to the formation of Sn-O and Sn-S bonds. In addition, an examination of the temperature-dependent thermoelectric (TE) properties demonstrates that the SnS2-MWCNT hybrid composite with 3 wt % MWCNTs exhibits the maximum power factor of ∼91.34 μW/(m·K2) at 500 K, which is ∼50 times larger than that of the pristine SnS2. These results highlight the fabrication and enhanced TE properties of hybrid composites via the coupling of SnS2 and MWCNTs.

Nano Sn2 S3 Embedded in Nitrogenous-Carbon Compounds for Long-Life and High-Rate Cycling Sodium-Ion Batteries.

Metallic tin (Sn) compounds are viewed as promising candidates for sodium-ion batteries (SIB) anode materials yet suffer from large volume expansion and limited electrode kinetics. Manufacturing rational structure is a crucial factor to achieve high-efficiency sodium storage for SIBs. In this study, nano Sn2 S3 embedded in nitrogenous-carbon compounds (nano-Sn2 S3 /C) was designed for SIB anode materials via a facile three-step strategy: precipitation, heat treatment and vulcanization with no templating agent. Density functional theory calculations suggested that Sn2 S3 displayed a low Na+ diffusion energy barrier and the Sn-S bonds could be rebuilt during the sodiation/de-sodiation process. Notably, electrochemical measurements coupled with ex-situ X-ray diffraction and ex-situ transmission electron microscopy were proposed to reveal the underlying Na+ storage mechanisms. Sn2 S3 acted as a high-capacity composition, while the porous nitrogenous-carbon matrix served as a rigid-conductive frame to accommodate the volume expansion and prevented the aggregation of nano Sn2 S3 . The rationally generated architectures benefited greatly in rate capacity and structural stability. As expected, the as-prepared nano Sn2 S3 /C exhibited remarkable rate capabilities with a specific capacity of 603 and 160 mAh g-1 under typical conditions at 0.2 and 4 A g-1 , respectively. This work may trigger new enthusiasm for engineering high-performance SIB anode materials.

Atomic Scale Structure of (Ag,Cu)2ZnSnSe4 and Cu2Zn(Sn,Ge)Se4 Kesterite Thin Films

Kesterite based materials are being researched and developed as affordable, efficient, and mechanically flexible absorber materials for thin film photovoltaics. Both (Ag,Cu)2ZnSnSe4 and Cu2Zn(Sn,Ge)Se4 based devices have shown great potential in overcoming some of the remaining challenges for further increasing the conversion efficiency of kesterite based solar cells. This study therefore investigates the long range crystallographic structure and the local atomic scale structure of technologically relevant thin films by means of grazing incidence X-ray diffraction and low temperature X-ray absorption spectroscopy. As expected, the unit cell dimensions change about an order of magnitude more than the element specific average bond lengths. In case of Cu2Zn(Sn,Ge)Se4, the thin film absorbers show a very similar behavior as Cu2Zn(Sn,Ge)Se4 powder samples previously studied. Small amounts of residual S in the thin films were taken into account in the analysis and the results imply a preferential formation of Sn-S bonds instead of Ge-S bonds. In (Ag,Cu)2ZnSnSe4, the dependence of the Ag-Se and Cu-Se bond lengths on Ag/(Ag+Cu) might indicate an energetic advantage in the formation of certain local configurations.

High-Performance Phase-Pure SnS Photocathodes for Photoelectrochemical Water Splitting Obtained via Molecular Ink-Derived Seed-Assisted Growth of Nanoplates.

Although tin monosulfide (SnS) is one of the promising earth-abundant semiconducting materials for photoelectrochemical water splitting, the performance of SnS photocathodes remains poor. Herein, we report a stepwise approach for the fabrication of highly efficient photocathodes based on SnS nanoplates via elaborate modulation of molecular solutions. It is demonstrated that phase-pure SnS nanoplates without detrimental secondary phases (such as SnS2 and Sn2S3) can be readily obtained by adjusting the amounts of Sn and S in the precursor solution. Additionally, the orientation of SnS nanoplates is controlled by implementing different types of SnS seed layers. The orientations of the SnS seed layers are changed according to the molecular shapes of the Sn-S bonds in the molecular solutions, depending on the relative nucleophilicity of the molecular moieties formed by specific thiol-amine reactions. The molecular Sn-S sheets in the seed ink was obtained by the reaction in a solvent mixture of thiogylcolic acid and ethanolamine. By contrast, the short Sn-S molecular rods result from the reaction in a solvent mixture of 2-mercaptoethanol and ethylenediamine. Interestingly, the relatively short rodlike morphology of the SnS seed induces the growth of SnS nanostructures faceted by preferred (111) and (101) planes, leading to fast charge transport. With the formation of a proper band alignment with n-type CdS and TiO2, the preferred (111)- and (101)-oriented SnS nanoplate-based photocathode exhibited a photocurrent density of -19 mA cm-2 at 0 V versus a reversible hydrogen electrode, establishing a new benchmark for SnS photocathodes.

Investigation of Laser Grooving Process on Copper Tin Sulfite Thin Films

Spray pyrolysis deposition has been successfully applied to fabricate CTS thin films onto glass substrates that maintained at 300°C, via the homemade fully computerized system. A mixture aqueous solution of thiourea and dihydrate chloride of Sn (II) and Cu (II) were used for the spraying process. Structural, optical, and morphological properties of CTS films were examined. XRD endorses a monoclinic crystallinity. XRD pattern has diffraction peaks at 2θ = 28.39°, 33.02°, 47.34° and 56.39°, respectively. The FTIR examination certified the vibration mode of Cu-S and Sn-S bonds. The crystallite size was noted about 78 nm, where measured by debye-Scherrer’s formula. Both absorption and transmission spectra were recorded in the wavelength range of 300-800 nm. The surface morphology of the fabricated CTS films exposed a uniform coating on the substrate with an applicable distribution. Laser grooving process was applied to grove the fabricated film. The groove width was found about 37 μm, etched via 500 mW blue laser source.

Stability of cubic tin sulphide nanocrystals: role of ammonium chloride surfactant headgroups.

New semiconducting metastable cubic phases have been recently discovered in the tin monosulfide and monoselenide systems. Surface energy calculations and experimental studies indicate that this cubic π-phase is stabilized by specific ligand adsorption on the surface. In this work, it is shown experimentally that the synthesis carried out using mixtures of oleylamine and oleylammonium chloride (OACl) surfactants results in the cubic phase, transforming the growth from orthorhombic to cubic nanoparticles with increasing OACl concentration up to a limiting point. Complementary ab initio calculations find that adsorbed ligands lower the surface energies for both the cubic phase and the orthorhombic phase, relative to the pristine surfaces. The decrease in the surface energy increases with ligand coverage. Stronger binding energies to the cubic phase suggest a higher coverage, and therefore preferential stabilization of this phase. Upon further increasing the coverage, the surface energy becomes negative, effectively destabilizing the particles in agreement with experimental observations. Bonding analysis shows that Cl bonds to Sn and replaces missing Sn-S bonds at the surface of the cubic structure. In the competing orthorhombic layered phase, Cl also bonds to a Sn atom but at the expense of one of the Sn-S bonds of this Sn atom. This observation can explain the trends of the surface energies. This combined experimental and computational analysis sheds light on the stabilization processes of these nano-materials and indicates the path to improve synthetic routes.

A potential “green” organotin: Bis-(methylthiopropyl)tin dichloride, [MeS (CH2)3]2SnCl2

The tetravalent organotin compound [MeS(CH2)3]2SnCl2, 1, has been synthesized in high yield and structurally characterized as being hexa-coordinate at tin with two intramolecular Sn-S bonds. The specific structure has been shown by theoretical calculations to be the low energy geometric structure available, and the differences associated with the experimental and calculated Sn-S bond lengths ascribed to crystal packing issues. The intramolecular Sn-S bonding produces a benign organotin compound with respect to its interactions with human natural killer cells; however, this blocking of coordination sites at Sn does not reduce its capacity to act as an efficient esterification catalyst.

Secondary bonding in di-methyl-bis-(morpholine-4-carbodi-thio-ato-κ2S,S')tin(IV): crystal structure and Hirshfeld surface analysis.

The title compound, [Sn(CH3)2(C5H8NOS2)2], has the SnIV atom bound by two methyl groups which lie over the weaker Sn-S bonds formed by two asymmetrically chelating di-thio-carbamate ligands so that the coordination geometry is skew-trapezoidal bipyramidal. The most prominent feature of the mol-ecular packing are secondary Sn⋯S inter-actions [Sn⋯S = 3.5654 (7) Å] that lead to centrosymmetric dimers. These are connected into a three-dimensional architecture via methyl-ene-C-H⋯S and methyl-C-H⋯O(morpholino) inter-actions. The Sn⋯S inter-actions are clearly evident in the Hirshfeld surface analysis of the title compound along with a number of other inter-molecular contacts.

Control of Phase in Tin Sulfide Thin Films Produced via RF-Sputtering of SnS2 Target with Post-deposition Annealing

Tin (II) Monosulfide (SnS) has become an interesting new material for thin film photovoltaics. SnS-based devices have achieved limited success in improved solar cell efficiency. While annealing is a typical post-deposition treatment used to improve thin film quality, sulfur volatility is an issue, despite strong Sn-S bonds in tin sulfide compounds. Annealing of sulfur-rich sputtered tin sulfide thin films in a vacuum environment has not been previously reported. In the present work, we investigated the optoelectronic properties, crystallographic phase, and morphology of annealed, sputtered tin sulfide thin films. Specifically, we studied the phase change and improvement in material quality as a result of post-deposition heat treatments. Tin sulfide thin films were sputtered with and without substrate heating. These samples were then annealed between 300°C and 500°C under moderate vacuum (<1 × 10−4 Pa) in the deposition chamber to find the optimal annealing process for producing α-SnS. Significantly improved crystallinity and morphology were seen in sulfur-rich thin films annealed at 400–500°C for 60 min. Annealed films had resistivity in the range of 30–300 Ω-cm. Experimental observations were confirmed by calculated phase diagrams, which show that annealing around 400°C at low pressure is optimal to obtain a phase-pure α-SnS film from an amorphous SnS2 film.

Synthesis and molecular structures of tris(thio- and selenophenyl)stannyl complexes of cyclopentadienylcarbonylnitrosylmanganese and their reaction products with tungsten carbony

Reactions of CpMn(CO)(NO)SnCl3 (I) with sodium benzenethiolate and sodium benzenesele-nolate gave orange crystals of the complexes CpMn(CO)(NO)Sn(EPh)3, where E = S (II) or Se (III). Treatment of complex II with photochemically generated W(CO)5(THF) yielded the adduct CpMn(CO)(NO)Sn(SPh)3 · W(CO)5 (IV). A similar treatment of complex III resulted in the formation of the ditungsten complex W2(CO)4(SePh)6 (V) with transfer of all chalcogenate groups from tin to tungsten. In reactions of complexes II and III with a Pt0 complex with phosphine and acetylene, (PPh3)2Pt(Ph2C2), the chalcogenate groups are transferred from tin. Only the known Pt(II) complexes (PPh3)2Pt(EPh)2), where E= S (VI) or Se (VII). Molecular structures IV and V were characterized by X-ray diffraction. It has been found that the Mn-Sn bond in complex IV (2.5479(9) A) is nearly the same length as that found earlier for complex II (2.5328(17) A) and is substantially shorter than the sum of the covalent radii of Mn and Sn (2.78 A). The Sn-S bond is noticeably lengthened (2.5217(11) A) only for the S atom bound to tungsten (W-S, 2.5696(12) A), while the other Sn-S bonds (2.4413(12) and 2.4291(12) A) are virtually the same as in complex II (on average, 2.441 A). Complex V contains the direct W-W bond (2.8153(16) A) supplemented with four benzeneselenolate bridges in which the W-Se bonds (on average, 2.642(2) A) are longer than the two terminal W-SePh bonds (2.571(2) A). All the W-Se bonds are much shorter than the sum of the covalent radii of W and Se (2.82 A).

The first examples of germanium tetrafluoride and tin tetrafluoride complexes with soft thioether coordination—synthesis, properties and crystal structures

The first thioether complexes of the hard Lewis acidic GeF(4) and SnF(4) have been prepared by reaction of [GeF(4)(MeCN)(2)] or [SnF(4)(MeCN)(2)] respectively with the thioether ligand in rigorously anhydrous CH(2)Cl(2) solution. The isolated compounds were characterised spectroscopically (IR, (1)H and (19)F{(1)H} NMR) and by microanalyses. Crystal structures of four representative examples, [GeF(4){MeS(CH(2))(2)SMe}], [GeF(4){EtS(CH(2))(2)SEt}], [SnF(4){EtS(CH(2))(2)SEt}] and [SnF(4){(i)PrS(CH(2))(2)S(i)Pr}], reveal distorted octahedral adducts with chelating thioethers, and weak, secondary Ge-S and Sn-S bonds. These compounds are the first reported examples of thioether complexes with any main group metal/metalloid fluoride acceptor.

Synthesis, spectral characterization and reactivity of chloro diphenyltin(Iv) dithiocomplexes having Sn-S bonds

The chloro diphenyltin(IV) complexes with the composition [(C 6 H 5 ) 2 Sn(Cl)(S(S)P(OR) 2 }] and [(C 6 H 5 ) 2 Sn(CI)(S(S)POGO}] (R = C 2 H 5 ; G = -CH 2 C(H)CH 3 , -CH 2 (CH 2 ) 3 CH 2 -) have been prepared by the reaction of diphenyltin(IV) dichloride with NH 4 salt of O,O'-dialkyl/alkylene dithiophosphate in absolute methanol at room temperature. The complexes have been characterized by their analytical data, IR, 1 H and 3 1 P NMR spectra. Lewis base character of the complexes has been established by reacting them with Hg, Cd and Ag I salts. The heterobimetallic adducts are formed through the coordination of the sulfur atom of chloro diphenyltin(IV) 0,0'-dialkyl/alkylene dithiophosphate to the soft metal acceptor.

Natural SnGeS3 from Radvanice near Trutnov (Czech Republic): its description, crystal structure refinement and solid solution with PbGeS3

Natural SnGeS 3 is monoclinic, with space group P2 1 /c and with a = 7.2704(15) A, b = 10.197(2) A, c = 6.8463(14) A, β = 105.34(3)°, V = 489.5 A 3 , a:b:c = 0.7130:1:0.6714, Z = 4 and D calc = 3.98 g/cm 3 . The strongest lines in the X-ray powder diffraction pattern are (d in A/I/I 0 (hkl)): 7.006/100 (100), 4.135/49 (120), 3.077/47 (130), 2.776/38 (022), 2.699/69 (211), 2.121/31 (320), 1.724/35 (41–2). It forms transparent, elastic and flexible flattened acicular crystals with cross-section 2–5 × 20–40 μm and up to 1 cm in the length, which produce random or fan-shaped clusters on rock fragments and on black crumbly ash. It has an orange to yellowish red colour, very light yellowish brown streak, vitreous to adamantine lustre; VHN 10g microhardness is 55 kp/mm 2 (539 MPa); two types of perfect cleavage were established - perpendicular or oblique to elongation. No fluorescence at 254 and 366 nm of UV light was observed. In reflected light SnGeS 3 is light greyish white with distinct orange brown internal reflections, anisotropic rotation tints are from dark brownish grey to reddish brown or brownish violet. Chemical analysis yields an average composition of Sn 40.47, Pb 0.29, Ge 22.73, Fe 0.03, Bi 0.27, Sb 0.10, As 0.10, S 31.42, Se 2.62, total 98.03 wt. %, leading to an empirical formula Sn 1.02 Ge 0.94 (S 2.93 Se 0.10 ) Σ3.03 . SnGeS 3 was also observed in multicomponent aggregates on which the above described acicular crystals grow. Phases of the SnGeS 3 -PbGeS 3 series in these aggregates form irregular grains 2–100 μm in size with a more variable composition. They exhibit an extensive solid solution between Pb and Sn limited to 70 mol. % Pb in the Sn position. SnGeS 3 formed under reducing conditions by direct crystallization from hot gasses (250–300°C) at a depth of 30–60 cm under the surface of a burning coal mine dump of the Kate ina mine at Radvanice near Trutnov, Czech Republic. It was found in close association with phases of the solid solutions Bi-Sb, Bi 2 S 3 -Sb 2 S 3 and Bi 2 S 3 -Bi 2 Se 3 ; Bi 3 S 2 , Cd 4 GeS 6 , SnS, CdIn 2 S 4 , GeAsS and GeS 2 . The crystal structure of natural SnGeS 3 was determined from single crystal X-ray diffraction data: (R 1 = 3.28 % for 1026 reflections with F 0 > 4σ[F 0 ]); it is isostructural with synthetic SnGeS3. GeS4 forms maximally collapsed tetrahedral chains along c which are interconnected via Sn-S bonds which form wavy layers parallel to (100); layers are interconnected via weak Sn-S interactions thorough spaces filled by lone electron pairs. SnS 5 has an unusual 1+4 coordination where four S atoms with very similar Sn-S distances define the base of a square pyramid. Inclusion of two distant S atoms complete the SnS 7 monocapped trigonal prismatic coordination where the prism body hosts the lone electron-pair of Sn 2+ .

Synthesis and reactivity of triphenyltin(IV) compounds containing Sn-S bonds

Synthesis and reactivity of triphenyltin(IV) compounds containing Sn-S bonds

Macrocycles, 7. Cyclization of oligo- and poly(ethylene glycol)s with dibutyltin dimethoxide - a new approach to (super)macrocycles

When commercial oligo- or poly(ethylene glycol)s and dibutyltin dimethoxide were condensed in bulk with elimination of methanol, no linear polycondensates were obtained and tin-containing macrocycles were the only reaction products. In order to improve the hydrolytic stability, stoichiometric amounts of γ-thiobutyrolactone were inserted into the macrocyclic oligoethers, so that the Sn-O bonds were transformed into Sn-S bonds. The formation of monomeric (containing one Bu 2 Sn group) macrocycles was confirmed. The tin-containing macrocyclic polyethers were used as macrocyclic initiators for the ring-expansion polymerization of e-caprolactone. The resulting macrocyclic poly(ether-ester)s were isolated in the form of telechelic A-B-A block copolymers after precipitation into methanol.

Diphenylbis(2-pyridinethiolato)tin(IV)

The polyhedron around tin in the title compound is a distorted trapezoidal bipyramid with the two C(phenyl) atoms in axial positions. The trapezoidal plane is formed by the two 2-pyridinethiolato residues which act as bidentate ligands with cis Sn-S and cis Sn-N bonds. Sn-N coordination is indicated by short intramolecular Sn-N distances [Sn-N(1)=2.636 (4), Sn-N(2)=2.698 (4) A]. The axial C atoms are shifted towards the half-sphere occupied by two N atoms resulting in a C-Sn-C angle of 125.5 (1) o . No short intermolecular interactions are observed