The crystallographic structure analysis of [Me3Sn(O2AsPh2)]n reveals

supramolecular association owing to symmetric bridges between Me3Sn

centres afforded by O2AsPh2 groups. The resulting polymer has a helical

topology. A systematic analysis of triorganotin arsinato and phosphinato

analogues indicates a role for the remote substituents on aggregations patterns

Harsan, Eugenia

Silaghi-Dumitrescu, Luminita

Tiekink, Edward R. T. *

Zukerman-Schpector, Julio

Sunway Institutional Repository

  ACADEMIA ROMÂNĂ Revue Roumaine de Chimie http://web.icf.ro/rrch/  Rev. Roum. Chim., 2016, 61(4-5), 277-282  Dedicated to Professor Alexandru T. Balaban on his 85 anniversary, with best wishes for a long, scientifically productive life AN INORGANIC HELIX IN THE SUPRAMOLECULAR STRUCTURE OF TRIMETHYLTIN DIPHENYLARSINATE, [Me3Sn(O2AsPh2)]n: A STRUCTURAL COMPARISON OF TRIORGANOTIN ARSINATES AND PHOSPHINATES Luminita SILAGHI-DUMITRESCU,a Eugenia HARSAN,b Julio ZUKERMAN-SCHPECTOR, c  Edward R.T. TIEKINKd and Ionel HAIDUCa* a Chemistry Department, Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University,  RO-400028 Cluj-Napoca, Roumania b Horticulture Research Station, University of Agricultural Sciences and Veterinary Medicine,RO-400372  Cluj-Napoca, Roumania c Laboratório de Cristalografia, Estereodinâmica e Modelagem Molecular, Departamento de Química,  Universidade Federal de São Carlos,C.P. 676, São Carlos, SP, 13565-905, Brazil d Centre for Crystalline Materials, Faculty of Science and Technology, Sunway University, 47500 Bandar Sunway,  Selangor Darul Ehsan, Malaysia Received December 21, 2015 The crystallographic structure analysis of [Me3Sn(O2AsPh2)]n reveals supramolecular association owing to symmetric bridges between Me3Sn centres afforded by O2AsPh2 groups. The resulting polymer has a helical topology. A systematic analysis of triorganotin arsinato and phosphinato analogues indicates a role for the remote substituents on aggregations patterns. OAsOPh PhSnMeMeMeO AsSnMeMeMePh PhO   INTRODUCTION*  Since the discovery of the DNA the helical strucures are fascinating the chemists and numerous are now known as supramolecular architectures, formed by self-assembly. Supramolecular chemistry is defined as the “chemistry of intermolecular bond” and “generalized coordination chemistry”.1 Intermolecular forces which can hold together the asociated molecules in a supramolecular structure can be dative-coordinate (Lewis acid-base interactions),2 hydrogen bonding,3 secondary bonds,4 metal lone pair...pi(arene) interactions,5 and other non-covalent                                                  * Corresponding author: ihaiduc@acad.ro interactions. As a result of a self-assembly process based upon molecular recognition and structural complementarity, many organometallic compounds form supramolecular architectures.2 When organometallic compounds containing both potentially donor and acceptor sites crystallize from nonpolar solvents, the inorganic part of the molecules tend to self-assemble into a central core which is externally surrounded by the organic groups. The later form a lipophylic “sleeve”, compatible with the organic (hydrocarbon) environment. This type has been underscored by H. Bock et al.6 for some alkali metal derivatives of organophosphoric anions. The  278 Luminita Silaghi-Dumitrescu et al. same principle is at work in many organometallic derivatives of organophosphorus ligands and in related organoarsenic derivatives.7  Among main group organometallic compounds organotin carboxylates are probably the best investigated supramolecular architectures, characterized by a broad compositional and structural variety,8 in which mono-, di- and triorganotin moieties can form very different types of mononuclear and polynuclear compounds. Equally attractive could be the organotin derivatives of element-organic oxoacids, e.g. organophosphoric and organoarsenic, as demonstrated by the already existing examples. However, their number is still limited. Thus, triorganotin derivatives of organophosphorus oxoacids are known to self-assemble with formation of supramolecular chain-like (linear and helical) arrays or discrete cyclic supermolecules, like the tetrameric trimethyltin diphenylphosphinate, [Me3SnO2PPh2]4,   Organotin derivatives of organoarsenic oxoacids are much less investigated. For comparison, we found of interest to examine the solid state structure of the arsenic analogue the related trimethyltin diphenylarsinate, Me3SnO2AsPh2,  The examination of the literature reveals that most attention was paid to organotin derivatives of dimethylarsinic acid, Me2As(O)OH,9 and only one study was made on an organotin derivative of phenylarsonic acid, PhAs(O)(OH)2, namely {Me3Sn[O2As(Ph)OH]}n .10  We report here the solid state of trimethyltin diphenylarsinate, which unlike its diphenylphosphinic analogue (a tetramer) was found to be a chain-like supramolecular polymer. RESULTS Trimethyltin diphenylarsinate, Me3SnO2AsPh2 (1), has been prepared from trimethyltin chloride and sodium diphenylarsinate in benzene: Me3SnCl + NaO2AsPh2  →   → Me3SnO2AsPh2 + NaCl and crystals suitable for X-ray diffraction analysis deposited from this solution on slow evaporation. The compound has been obtained earlier by two different other procedures (oxidation of Me3SnAsPh2 and condensation of Me3SnOSnMe3 with Ph2As(O)OH) and reported as tetrameric in benzene solution.11 The X-ray structure determination reveals [Me3Sn(O2AsPh2)]n to be a coordination polymer with the asymmetric unit comprising one formula unit, Fig 1(a).  The diphenylarsinato anion is µ2-bridging, linking two tin centres in a coordination polymer propagating along the crystallographic b-axis, i.e. being generated by a 21-screw symmetry so that the chain has the topology of a helix, Fig. 1(b). The Sn–O1, O2 bond lengths are experimentally equivalent at 2.224(2) and 2.225(2) Å, an observation related to the equivalence of the As–O1, O2i bond lengths [1.658(2) and 1.661(2) Å for i: 1-x, -½+y, 1½-z].  The tin atom is penta-coordinate within a trans-C3O2 donor set.  The computed value of τ is 0.90 which compares with  τ = 0.0 and 1.0 for ideal square pyramidal and trigonal bipyramidal coordination geometries, respectively.12  The deviation of the trans angle, i.e. 174.99(9)º, for the ideal 180º is only minor.  Similarly, the trigonal C–Sn–C angles span a narrow range [118.6(2) to 121.2(2)º] as do the O–Sn–C angles [87.18(15) to 93.75(13)º]. The supramolecular chains assemble in the crystal without directional intermolecular interactions between them in accord with the geometric criteria assumed in PLATON,13 Fig. 1(c). DISCUSSION A search of the Cambridge Structural Database (CSD)14 was undertaken to seek literature precedents for triorganotin compounds with diorganoarsinato ligands.  This revealed some related compounds, e.g. [Me3Sn(O2AsMe2)]n 9a and [Ph3Sn(O2AsMe2)]n.9c Simplified illustrations for these coordination polymers are shown in Fig. 2, and selected geometric parameters are given in Table 1.  As mentioned above, the title compound, [Me3Sn(O2AsPh2)]n, is a helical polymer.  Similar but non-identical helical chains are found in trimethyltin derivative [Me3Sn(O2AsMe2)]n9a; in this compound two independent formulae units comprise the asymmetric unit and non-systematic differences in key geometric parameters are apparent, Table 1.  Further, while helical, the helix is somewhat stretched in this chain with disparate pitches.  In {Me3Sn[O2As(Ph)OH]}n,10 the R’ groups are distinct, i.e. methyl and hydroxyl.  This introduces asymmetry in the Sn–O bond lengths if not for electronic reasons, this is due to hydrogen bonding interactions between neigh bouring chains.  In this scheme, chains are linked into a two-dimensional array via eight-membered {…HOAsO}2 synthons.  The bridging-O atom involved in this hydrogen bonding interaction forms the longer of the Sn–O bonds. A quite distinctive chain is found in the crystal structure of [Ph3Sn(O2AsMe2)]n [9c] which is strictly linear.  By contrast to the pitches observed for the three trimethyltin compounds, the pitch in  Inorganic helix 279 [Ph3Sn(O2AsMe2)]n 9c has elongated to 7.00 Å, and this gives a clue for the observed distinct topology in this structure.  As often invoked in the structural chemistry organotin carboxylates (see INTRODUCTION), steric effects can influence structural motifs, at least in the solid-state.8  In the present circumstances, the presence of three (relatively) bulky phenyl rings about the tin atom precludes the adoption of the helical chain.   Fig. 1 – (a) Molecular structure diagram of the asymmetric unit in [Me3Sn(O2AsPh2)]n, extended to show the immediate coordination environment of the arsenic atom, and showing the atom labelling and displacement ellipsoids at the 35% probability level; i: 1-x,  -½+y, 1½-z.  (b) A side-on view of the coordination polymer.  (c) The unit cell contents viewed in projection down the b-axis, the axis                                                              of propagation of the coordination polymer shown in (b).   Fig. 2 – Images of coordination polymers for (a) [Me3Sn(O2AsPh2)]n, (b) [Me3Sn(O2AsMe2)]n, (c) [Ph3Sn(O2AsMe2)]n and (d) {Me3Sn[O2As(Ph)OH]}n.  For reasons of clarity, non-acidic hydrogen atoms have been removed and carbon-containing residues                    illustrated in (black) stick form.  Colour code: orange, tin; olive-green, arsenic; red, oxygen; green, hydrogen. 280 Luminita Silaghi-Dumitrescu et al. Table 1 Selected geometric data (Å, º) for [R3Sn(O2AsR’2)] and [R3Sn(O2PR’2)] compounds   Compound Sn–O1,   Sn-O2 O1–Sn-O2 O1–As-O2 Pitch Ref.  [Me3Sn(O2AsPh2)]n 2.224(2) 174.99(9) 116.97(14) 4.86 this work  2.225(2) [Me3Sn(O2AsMe2)]n 2.196(2) 174.49(9) 110.92(11) 5.04 [9a]  2.219(2)  2.2067(19) 176.48(7) 111.95(11) 5.48  2.277(2) [Ph3Sn(O2AsMe2)]n 2.165(4) 178.38(13) 106.35(17) 7.00 [9c]  2.170(4) {Me3Sn[O2As(Ph)OH]}n 2.168(2) 173.03(7) 114.16(9) 5.23 [10]  2.3577(1)   [Me3Sn(O2PMe2)]n 2.208(10) 174.2(4) 115.0(6) 5.35 [15]  2.208(10) [n-Bu3Sn(O2PMe2)]n 2.220(7) 176.2(3) 117.4(4) 5.91 [16]  2.241(7) [Me3Sn(O2PPh2)]4 2.250(6) 178.1(3) 117.4(5) – [17]  2.250(6)  2.238(6) 178.6(3) 117.2(5) –  2.238(6)  2.224(6) 176.2(2) 117.2(5) –  2.245(7) {n-Bu3Sn[O2P(CMe2C(H)MeCMe2)]}4  2.209(4) 176.20(14) 116.5(2) – [18]  2.268(4) [(Ph2PO2)Sn(CH2)3Sn(O2PPh2)]2  2.205(4) 175.18(15) 115.9(3) – [19]   2.237(4)  2.215(3) 176.26(12) 116.3(3) –  2.246(3)    Fig. 3 – Images of coordination polymers and an oligomer for (a) [Me3Sn(O2PMe2)]n, (b) [n-Bu3Sn(O2AsPh2)]n and (c) [Me3Sn(O2PPh2)]4.  For reasons of clarity, all hydrogen atoms have been removed and carbon-containing residues illustrated in                                                (black) stick form.  Colour code: orange, tin; pink, arsenic; red, oxygen.  Discussion is now extended to include triorganotin phosphinate derivatives for which only five structures are available in the CSD.14  Two of the derivatives adopt chain motifs, one of which has the topology of a zigzag chain, i.e. [Me3Sn(O2PMe2)]n,15 Fig. 3(a), and the other, i.e. [n-Bu3Sn(O2PMe2)]n,16 having a helical topology, Fig. 3(b).  The direct analogue of the title compound, i.e. [Me3Sn(O2PPh2)]4,17 is a cyclic tetramer with mirror symmetry (i.e. three  Inorganic helix 281 independent tin atoms) bisecting the molecule.  Similar oligomeric structures are found for each of {n-Bu3Sn[O2P(CMe2C(H)MeCMe2)]}4,18 which has crystallographic 4-fold symmetry (i.e. one independent tin atom), and [(Ph2PO2)Sn(CH2)3Sn(O2PPh2)]2,19 which is located about a centre of inversion (i.e. two independent tin atoms). Direct analogues available for comparison are found in the crystal structures of [Me3Sn(O2AsMe2)]n 9a and [Me3Sn(O2PMe2)]n.15 While both adopt supramolecular chain, the former is extended helical and the latter zigzag.  The pitch in [Me3Sn(O2PMe2)]n15 is intermediate between the two independent pitches in [Me3Sn(O2AsMe2)]n,9a Table 1.  The three other triorganotin phosphinate struc-tures, with either or both bulky tin- or phosphorus-bound substituents have tetrameric motifs. Clearly, even for this small series of compounds, great structural diversity is observed, seemingly related to the steric bulk of the tin- or arsenic-/phosphorus-bound groups. EXPERIMENTAL Preparation of [Me3Sn(O2AsPh2)]n Sodium diphenylarsinate, Na[O2AsPh2], was prepared by treating  0.262 g (1 mmol) Ph2As(O)OH  with NaOH (0.04 g, 1mmol) in benzene and to the resulting suspension was added a solution of Me3SnCl (0.20g, 1mmol) in benzene. The mixture was stirred for 3 hrs, then filtered and the solvent evaporated on a rotavap. Yield:  65.7 % (Me3Sn)O2AsPh2). M.p. 160oC. IR Spectrum (cm-1): 552, 541 (νSn-C), 601, 604 ((νAs-C) , 761, 742 (νAs-O), 857 (νAs=O),  Crystals for X-ray analysis deposited from the benzene filtrate on standing. Crystal Structure Determination Intensity data were measured at 293 K on a Bruker SMART APEX I CCD with Mo Kα (λ = 0.71073 Å) radiation.  Data processing and absorption corrections were accomplished with SMART.20 SAINT21 and SADABS.22  The structure was solved with SIR-201423 and refined (SHELXL-2014/624) on F2 by full-matrix least-squares with anisotropic displacement parameters for all non-hydrogen atoms, and with hydrogen atoms included in the riding model approximation with Uiso = 1.2-1.5Ueq(carrier atom).  A weighting scheme of the form w = 1/[σ2(Fo2) + (0.038P)2 + 0.264P] where P = (Fo2 + 2Fc2)/3 was introduced.  Details of unit cell data, X-ray data collection and structure refinement are given in Table 2.  The programs ORTEP-3 for Windows,25 PLATON13 and DIAMOND26 were also used in the analysis. CONCLUSIONS The status of triorganotin compounds of both arsinato and phosphinato ligands is still in its infancy.  Already, several quite distinct structural motifs are apparent and early evidence suggests a dependency upon the tin- and/or arsenic-/phosphorus-bound substituents.  Table 2 Crystallographic data and refinement details for (1)   Formula C15H19AsO2Sn  Formula weight 424.91  Crystal colour, habit Colourless prism  Crystal size/mm 0.13 x 0.14 x 0.26  Crystal system monoclinic  Space group P21/c  a/Å 11.9615(10)  b/Å 9.7260(9)  c/Å 15.660(2)  β/º 112.244(9)  V/Å3 1686.3(3)  Z/Z′ 4/1  Dc/g cm-3 1.674  F(000) 862  µ (MoK α)/mm-1 3.458  Measured data 3082  θ range/° 1.8 – 25.0  Unique data 2961  Rint 0.032  Observed data (I ≥ 2.0 σ (I)) 2303  R, obs. data; all data 0.023; 0.064  Rw, obs. data; all data 0.044; 0.0704  ∆ρmax, min/e Å–3 0.40; 0.53  CCDC deposition no. 1452012 282 Luminita Silaghi-Dumitrescu et al. Acknowledgements: The Brazilian National Council for Scientific and Technological Development-CNPq (Fellowship 305626/2013-2 to JZS). REFERENCES 1.  J. M. Lehn, “Supramolecular Chemistry, Concepts and Perspectives”, VCH Weinheim, New York, 1995. 2.  I. Haiduc and F. T. 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An inorganic helix in the supramolecular structure of trimethyltin diphenylarsinate, [me3sn(o2asph2)]n: a structural comparison of triorganotin arsinates and phosphinates

An inorganic helix in the supramolecular structure of trimethyltin diphenylarsinate, [me3sn(o2asph2)]n: a structural comparison of triorganotin arsinates and phosphinates

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