The title compound, trimeth­yl(tetra­hydro­furan-κO)aluminium(III), [Al(CH3)3(C4H8O)], is an addition product of tri­methyl­aluminium and tetra­hydro­furan (THF). Instead of a dimeric structure, which is very common for these types of compounds, a monomeric mol­ecular structure is observed. The C—Al—C angles in the mol­ecule are very different from the C—Al—C angles found in dimeric mol­ecular structures, leading to a different symmetry around the AlIII atom. The reasons for these differences are discussed

Brieger, Lukas

Hermann, Andreas

Strohmann, Carsten

Unkelbach, Christian

English

Eldorado - Ressourcen aus und für Lehre, Studium und Forschung

research communicationsActa Cryst. (2018). E74, 267–270 https://doi.org/10.1107/S2056989018001275 267Received 10 January 2018Accepted 20 January 2018Edited by A. J. Lough, University of Toronto,CanadaKeywords: crystal structure; aluminium; tri-methylaluminium; thf; adduct; monomer; angle.CCDC reference: 1588683Supporting information: this article hassupporting information at journals.iucr.org/eCrystal structure and quantum-chemical calcula-tions of a trimethylaluminium–THF adductLukas Brieger, Andreas Hermann, Christian Unkelbach and Carsten Strohmann*Technische Universität Dortmund, Anorganische Chemie, Otto-Hahn-Strasse 6, D-44227 Dortmund, Germany.*Correspondence e-mail: carsten.strohmann@tu-dortmund.deThe title compound, trimethyl(tetrahydrofuran-O)aluminium(III),[Al(CH3)3(C4H8O)], is an addition product of trimethylaluminium and tetra-hydrofuran (THF). Instead of a dimeric structure, which is very common forthese types of compounds, a monomeric molecular structure is observed. TheC—Al—C angles in the molecule are very different from the C—Al—C anglesfound in dimeric molecular structures, leading to a different symmetry aroundthe AlIII atom. The reasons for these differences are discussed.1. Chemical contextSimilar to diborane, trimethylaluminium is present as a dimerat room temperature. Analogously, two monomers areconnected by two three-center–two-electron bonds bridgingboth molecules. The monomer of trimethylaluminium can beobserved at high temperatures and low pressure with atrigonal-planar symmetry in the gas phase (Almenningen etal., 1971). The most important use of trimethylaluminium is inthe production of methylaluminoxane, which is used to acti-vate the Ziegler–Natta catalysts for olefin polymerization(Andresen et al., 1976). Another known and importantapplication is in the synthesis of Tebbe’s reagent, which is usedfor methylenation reactions in organic synthesis (Herrmann,1982). The monomeric structure of trimethylaluminium inTHF could lead to a higher reactivity of this compound inthese applications. Different THF adducts of trimethyl-aluminium are known (Kong et al., 1995; Vidyaratne et al.,2009; Tanner et al., 1993), but on the one hand the tri-methylaluminium–THF adduct is obtained as a co-crystallateand on the other it is part of a calcium sandwhich complex.Many ether adducts of AlMe3 are also known (see e.g.Robinson et al., 1985, 1987; Zhao et al., 1999; Leman et al.,1993; Hsiao et al., 2016; Zhang et al., 1985; Atwood et al., 1983).We decided to synthesize the THF adduct of trimethyl-aluminium specifically to analyse its properties.ISSN 2056-98902. Structural commentaryIn the presence of THF, no dimeric trimethylaluminium, butinstead a monomeric trimethylaluminium–thf adduct wasformed. It was synthesized from a trimethylaluminium solu-tion in n-heptane under inert conditions. Crystals of thiscompound are pyrophoric, sensitive to moisture, oxygen andhigh temperature. As a consequence, they were handled andprepared at low temperature under an argon atmosphere. Thetitle compound (Fig. 1) shows a structure between trigonal–planar and tetrahedral symmetry, as indicated by the threeC—Al—C angles [116.43 (9), 116.24 (9), 114.97 (9); Table 1].As a result of the weak interaction between aluminium andoxygen, an elongated Al—O bond distance is observed[1.9131 (13) Å]. The Al—O bond distance is very similar tothose in known aluminium–THF adducts [Lehmkuhl et al.,1985 (CSD recode DENGIM; Groom et al., 2016); Schnitter etal., 1997 (refcode NIKJEW)] and other molecular structureswhere this compound could be obtained as a co-crystallate[Kong et al., 1995 (YUGWEC); Vidyaratne et al., 2009(IHEYOK)]. Even longer Al—O bonds can be observed in themolecular structure of a dioxane–trimethylaluminium adduct[2.02 (2) Å; Atwood & Stucky, 1967 (TMALOX)] and in themolecular structure of trimethylaluminium with 18-crown-6[2.005 (6) Å; Atwood et al., 1982 (BOYVEQ)]. The dimericaluminium structure (AFODUU) observed by Sharma et al.(2002) shows very short Al—O bonds for the terminal andbridging isopropoxy groups bound to the tetra-coordinatedpositions [1.799 (3)–1.685 (3) Å], indicating a strong inter-action between aluminium and oxygen in these cases. Theseresults support the weak interaction between aluminium andoxygen in the title compound, leading to a slight distortion ofthe trimethylaluminium and a structure between trigonal–planar and tetrahedral symmetry. In contrast to the mono-meric structure, the dimeric molecular structure of tri-methylaluminium features one large C—Al—C angle and twosmaller C—Al—C angles [123.55 (1), 107.26 (1), 106.79 (1)].As a result of the lower electron density of the two bridgingAl—C bonds, less space is required in the coordination sphereof the aluminium atom. In comparison with an ideal tetra-hedral coordination sphere, there is a smaller angle for thebridging bonds and a larger angle for the terminal bonds(Stammler et al., 2015). These results are supported by furtherdimeric molecular structures of trimethylaluminium. Niki-forov et al. (2008) reported a titanium complex (BOFNOA)with a trimethylaluminium unit with one large C—Al—Cangle and two smaller C—Al—C angles [119.32 (13),103.34 (13), 103.39 (12) and 115.86 (13), 106.78 (13),100.29 (12)]. Occhipinti et al. (2011) reported the synthesisand stability of homoleptic metal(III) tetramethylaluminates,which feature one large C—Al—C angle for the terminalbonds and two smaller C—Al—C angles for the bridgingbonds. For the crystal strucutre of Tm(AlMe4)3, a large C—Al—C angle for the terminal bonds [118.55 (7) or 119.5 (2)]and two smaller angles [104.84 (7), 108.64 (7) or 105.43 (6),108.86 (7)] were observed.3. Quantum-chemical calculationsQuantum-chemical calculations with the minnesota functionalM062X, basis set 6–311+G(2df,p) and the solvent model(PCM) were applied to verify the C—Al and C—O bondlengths as well as the C—Al—C angles. Apparently, a simplegas-phase calculation is not sufficient to describe the crystalprecisely, and leads to different results than found in themonomeric molecular structure of this compound. Thereforewe decided to use the solvent model (PCM). Götz et al. (2010)have recently evaluated the ability of an embedded-clustermodel with polarizable continuum solvents (PCM) to repro-duce the crystal environmental effects. Those models wereused to reproduce the crystal environmental effects onQTAIM parameters inside the tetrameric unit of solid MeLi(Götz et al., 2013).The NBO analysis of the Al—C bond indicates an occu-pancy of 82% for carbon and an occupancy of 18% foraluminium. The carbon part of the bond consists of 34%s-character and 66% p-character, whereas the aluminium partof the bond consists of 29% s-character, 70% p-character and1% d-character. These results are in good agreement withthe observed C—Al—C angles [116.43 (9), 116.24 (9),114.97 (9)]. The greater electronegativity of carbon providesmore p-character in the Al—C bond, resulting in smallerangles than 120. The NBO analysis for the Al—O bondindicates an occupancy of 94% for oxygen and an occupancyof 6% for aluminium. The oxygen part of the bond consists of41% s-character and 59% p-character whereas the aluminium268 Brieger et al.  [Al(CH3)3(C4H8O)] Acta Cryst. (2018). E74, 267–270research communicationsFigure 1The molecular structure of the title compound, with displacementellipsoids drawn at the 50% probability level.Table 1Selected geometric parameters (Å, ).O1—Al1 1.9131 (13) C6—Al1 1.976 (2)C5—Al1 1.9671 (19) C7—Al1 1.965 (2)C5—Al1—C6 116.43 (9) C1—O1—Al1 122.45 (10)C5—Al1—C7 116.24 (9) C4—O1—Al1 124.00 (11)C6—Al1—C7 114.97 (9) C4—O1—C1 109.40 (13)part of the bond consists of 14% s-character and 84% p-character and 2% d-character. The details of the NBO analysisare summarized in Table 2.4. Database surveyThe basic building unit, trimethylaluminium, has been knownfor a long time and has been completely characterized (Lewis& Rundle, 1953; Vranka & Amma 1967). Studies using singlecrystal X-ray analysis have been made, determining the exactstructure, and were found in a search of the CambridgeStructural Database (Groom et al., 2016). A dimeric structurewith bridging methyl groups can be obtained, which is formedby two monomers that share a center of symmetry. An interiorAl—C—Al angle of about 74 and an exterior C—Al—Cangle of about 124 were observed. Furthermore the Al—Cdistances have significant differences. The Al—C bridgingdistance is 2.14 Å, whereas the Al—C terminal distance isabout 2.00 Å. Trimethylaluminium–THF adducts have beenreported already. On the one hand this compound wasobserved as a co-crystallate of a self-activating ethylenetrimerization catalyst (IHEYOK; Vidyaratne et al., 2009) andon the other hand as a co-crystallate of an unusual transition-metal cluster (YUGWEC; Kong et al., 1995). The co-crystal-late has not been further analysed.5. Synthesis and crystallizationTrimethylaluminium is predominately a dimer in hydrocarbonsolution. The structure was obtained treating 200 mg(1.38 mmol, 1.0 eq.) of a 2 M solution of trimethylaluminiumin n-heptane with 0.08 ml (1.38 mmol, 1.0 eq.) THF underinert conditions. The sample was stored under an argonatmosphere at 193 K for two weeks and crystallized ascolourless blocks. The yield was not determined. The crystalsare pyrophoric and were prepared with the help of ‘X-Temp 20(Heine & Stalke, 1992; Stalke, 1998). Further methods ofanalysis or characterization were not possible because of thehigh reactivity of this compound.6. RefinementCrystal data, data collection and structure refinement detailsare summarized in Table 3. The C-bound H atoms wereincluded in calculated positions and treated as riding atoms,with C—H = 0.98 Å, Uiso(H) = 1.5Ueq(C) for methyl hydrogenatoms and C—H = 0.99 Å, Uiso(H) = 1.2Ueq(C) for methylenehydrogen atoms.Funding informationWe are grateful to the Deutsche Forschungsgemeinschaft(DFG) for financial support.ReferencesAlmenningen, A., Halvorsen, S. & Haaland, A. (1971). Acta Chem.Scand. 25, 1937–1945.Andresen, A., Cordes, H.-G., Herwig, J., Kaminsky, W., Merck, A.,Mottweiler, R., Pein, J., Sinn, H. & Vollmer, H.-J. (1976). Angew.Chem. Int. Ed. Engl. 15, 630–632.Atwood, J. L., Hrncir, D. C., Shakir, R., Dalton, M. S., Priester, R. D.& Rogers, R. D. (1982). Organometallics, 1, 1021–1025.Atwood, J. L., Priester, R. D., Rogers, R. D. & Canada, L. G. (1983). J.Inclusion Phenom. 1, 61–69.Atwood, J. L. & Stucky, G. D. (1967). J. Am. Chem. Soc. 89, 5362–5366.Burla, M. C., Caliandro, R., Camalli, M., Carrozzini, B., Cascarano,G. L., De Caro, L., Giacovazzo, C., Polidori, G., Siliqi, D. & Spagna,R. (2007). J. Appl. Cryst. 40, 609–613.Dolomanov, O. V., Bourhis, L. J., Gildea, R. J., Howard, J. A. K. &Puschmann, H. (2009). J. Appl. Cryst. 42, 339–341.Götz, K., Gessner, V. H., Unkelbach, C., Kaupp, M. & Strohmann, C.(2013). Z. Anorg. Allg. Chem. 639, 2077–2085.Götz, K., Meier, F., Gatti, C., Burow, A., Sierka, M., Sauer, J. &Kaupp, M. (2010). J. Comput. Chem. 31, 2568–2576.Groom, C. R., Bruno, I. J., Lightfoot, M. P. & Ward, S. C. (2016). ActaCryst. B72, 171–179.Heine, A. & Stalke, D. (1992). Angew. Chem. Int. Ed. Engl. 31, 854–855.Herrmann, W. A. (1982). Adv. Organomet. Chem. 20, 195–197.Hsiao, H.-C., Datta, A., Chen, Y.-F., Chang, W., Lee, T.-Y., Lin, C.-H.& Huang, J.-H. (2016). J. Organomet. Chem. 804, 35–41.research communicationsActa Cryst. (2018). E74, 267–270 Brieger et al.  [Al(CH3)3(C4H8O)] 269Table 2NBO analysis.Al—O Al O Al—C Al COccupancy 5.70% 94.30% 18.22% 81.78%s 14.29% 41.14% 28.82% 33.59%p 83.68% 58.84% 70.24% 66.39%d 1.95% 0.01% 0.91% 0.01%Table 3Experimental details.Crystal dataChemical formula [Al(CH3)3(C4H8O)]Mr 144.18Crystal system, space group Monoclinic, P21/cTemperature (K) 150a, b, c (Å) 7.7034 (6), 9.1228 (7), 13.6833 (11) () 98.845 (8)V (Å3) 950.18 (13)Z 4Radiation type Mo K (mm1) 0.15Crystal size (mm) 0.4  0.4  0.2Data collectionDiffractometer Oxford Diffraction XcaliburSapphire3Absorption correction Multi-scan (CrysAlis PRO; OxfordDiffraction, 2010)Tmin, Tmax 0.767, 0.971No. of measured, independent andobserved [I > 2(I)] reflections16552, 2071, 1664Rint 0.085(sin /)max (Å1) 0.639RefinementR[F 2 > 2(F 2)], wR(F 2), S 0.054, 0.152, 1.09No. of reflections 2071No. of parameters 85H-atom treatment H-atom parameters constrained	max, 	min (e Å3) 0.89, 0.33Computer programs: CrysAlis PRO (Oxford Diffraction, 2010), SIR2004 (Burla et al.,2007), SHELXL2014 (Sheldrick, 2015) and OLEX2 (Dolomanov et al., 2009).Kong, G., Harakas, G. N. & Whittlesey, B. R. (1995). J. Am. Chem.Soc. 117, 3502–3509.Lehmkuhl, H., Mehler, K., Shakoor, A., Krüger, C., Tsay, Y.-H.,Benn, R., Rufińska, A. & Schroth, A. (1985). Chem. Ber. 118, 4248–4258.Leman, J. T., Landry, C. C. & Barron, A. R. (1993). Main Group Met.Chem. 16, 193–199.Lewis, P. H. & Rundle, R. E. (1953). J. Chem. Phys. 21, 986–992.Nikiforov, G. B., Roesky, H. W., Heisen, B. C. & Oswald, R. B. (2008).Organometallics, 27, 2544–2548.Occhipinti, G., Meermann, C., Dietrich, H. M., Litlabø, R., Auras, F.,Törnroos, K. W., Maichle-Mössmer, C., Jensen, V. R. & Anwander,R. (2011). J. Am. Chem. Soc. 133, 6323–6337.Oxford Diffraction (2010). CrysAlis PRO. Oxford Diffraction,Yarnton, England.Robinson, G. H., Bott, S. G., Elgamal, H., Hunter, W. E. & Atwood,J. L. (1985). J. Inclusion Phenom. 3, 65–69.Robinson, G. H., Hunter, W. E., Bott, S. G. & Atwood, J. L. (1987). J.Organomet. Chem. 326, 9–16.Schnitter, C., Roesky, H. W., Albers, T., Schmidt, H.-G., Röpken, C.,Parisini, E. & Sheldrick, G. M. (1997). Chem. Eur. J. 3, 1783–1792.Sharma, N., Sharma, R. K., Bohra, R., Drake, J. E., Hursthouse, M. B.& Light, M. E. (2002). J. Chem. Soc. Dalton Trans. 1631–1634.Sheldrick, G. M. (2015). Acta Cryst. C71, 3–8.Stalke, D. (1998). Chem. Soc. Rev. 27, 171–178.Stammler, H.-G., Blomeyer, S., Berger, R. J. F. & Mitzel, N. W. (2015).Angew. Chem. Int. Ed. 54, 13816–13820.Tanner, P. S., Williams, R. A. & Hanusa, T. P. (1993). Inorg. Chem. 32,2234–2235.Vidyaratne, I., Nikiforov, G. B., Gorelsky, S. I., Gambarotta, S.,Duchateau, R. & Korobkov, I. (2009). Angew. Chem. Int. Ed. 48,6552–6556.Vranka, R. G. & Amma, E. L. (1967). J. Am. Chem. Soc. 89, 3121–3126.Zhang, H., Means, C. M., Means, N. C. & Atwood, J. L. (1985). J.Crystallogr. Spectrosc. Res. 15, 445–452.Zhao, Q., Sun, H.-S. & You, X.-Z. (1999). J. Organomet. Chem. 572,59–64.270 Brieger et al.  [Al(CH3)3(C4H8O)] Acta Cryst. (2018). E74, 267–270research communicationssupporting informationsup-1Acta Cryst. (2018). E74, 267-270    supporting informationActa Cryst. (2018). E74, 267-270    [https://doi.org/10.1107/S2056989018001275]Crystal structure and quantum-chemical calculations of a trimethylaluminium–THF adductLukas Brieger, Andreas Hermann, Christian Unkelbach and Carsten StrohmannComputing details Data collection: CrysAlis PRO (Oxford Diffraction, 2010); cell refinement: CrysAlis PRO (Oxford Diffraction, 2010); data reduction: CrysAlis PRO (Oxford Diffraction, 2010); program(s) used to solve structure: SIR2004 (Burla et al., 2007); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: OLEX2 (Dolomanov et al., 2009).Trimethyl(tetrahydrofuran-κO)aluminium(III) Crystal data [Al(CH3)3(C4H8O)]Mr = 144.18Monoclinic, P21/ca = 7.7034 (6) Åb = 9.1228 (7) Åc = 13.6833 (11) Åβ = 98.845 (8)°V = 950.18 (13) Å3Z = 4F(000) = 320Dx = 1.008 Mg m−3Mo Kα radiation, λ = 0.71073 ÅCell parameters from 8661 reflectionsθ = 2.2–29.4°µ = 0.15 mm−1T = 150 KBlock, colourless0.4 × 0.4 × 0.2 mmData collection Oxford Diffraction Xcalibur Sapphire3 diffractometerRadiation source: Enhance (Mo) X-ray SourceGraphite monochromatorDetector resolution: 16.0560 pixels mm-1ω scansAbsorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2010)Tmin = 0.767, Tmax = 0.97116552 measured reflections2071 independent reflections1664 reflections with I > 2σ(I)Rint = 0.085θmax = 27.0°, θmin = 2.7°h = −9→9k = −11→11l = −17→17Refinement Refinement on F2Least-squares matrix: fullR[F2 > 2σ(F2)] = 0.054wR(F2) = 0.152S = 1.092071 reflections85 parameters0 restraintsPrimary atom site location: structure-invariant direct methodsHydrogen site location: inferred from neighbouring sitesH-atom parameters constrainedw = 1/[σ2(Fo2) + (0.101P)2 + 0.0468P] where P = (Fo2 + 2Fc2)/3(Δ/σ)max = 0.001supporting informationsup-2Acta Cryst. (2018). E74, 267-270    Δρmax = 0.89 e Å−3 Δρmin = −0.32 e Å−3Special details Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) x y z Uiso*/UeqO1 0.23608 (15) 0.37473 (13) 0.62125 (9) 0.0358 (3)C1 0.4234 (2) 0.3761 (2) 0.61379 (15) 0.0403 (4)H1A 0.4953 0.3839 0.6801 0.048*H1B 0.4521 0.4592 0.5726 0.048*C2 0.4549 (3) 0.2322 (2) 0.56601 (16) 0.0500 (5)H2A 0.5778 0.1990 0.5853 0.060*H2B 0.4284 0.2389 0.4930 0.060*C3 0.3280 (3) 0.1316 (2) 0.60652 (16) 0.0507 (5)H3A 0.3019 0.0440 0.5642 0.061*H3B 0.3748 0.1000 0.6747 0.061*C4 0.1680 (3) 0.2259 (2) 0.60476 (16) 0.0445 (5)H4B 0.0906 0.2184 0.5401 0.053*H4A 0.1006 0.1966 0.6576 0.053*C5 0.2460 (3) 0.7005 (2) 0.65333 (15) 0.0439 (5)H5A 0.3731 0.6915 0.6742 0.066*H5B 0.2022 0.7858 0.6856 0.066*H5C 0.2212 0.7130 0.5814 0.066*C6 0.1905 (3) 0.4582 (2) 0.83000 (15) 0.0461 (5)H6A 0.1225 0.3705 0.8410 0.069*H6B 0.1635 0.5367 0.8742 0.069*H6C 0.3162 0.4354 0.8438 0.069*C7 −0.1208 (3) 0.5008 (2) 0.63514 (15) 0.0436 (5)H7A −0.1357 0.5156 0.5634 0.065*H7B −0.1902 0.5737 0.6648 0.065*H7C −0.1608 0.4021 0.6493 0.065*Al1 0.12856 (7) 0.52245 (6) 0.69114 (4) 0.0335 (2)Atomic displacement parameters (Å2) U11 U22 U33 U12 U13 U23O1 0.0322 (7) 0.0311 (6) 0.0447 (7) −0.0050 (5) 0.0082 (5) −0.0018 (5)C1 0.0311 (9) 0.0408 (10) 0.0500 (11) −0.0005 (7) 0.0088 (7) 0.0007 (8)C2 0.0481 (11) 0.0471 (12) 0.0560 (13) 0.0081 (9) 0.0119 (9) −0.0046 (9)C3 0.0624 (14) 0.0336 (10) 0.0554 (13) 0.0024 (9) 0.0067 (10) 0.0011 (8)C4 0.0451 (10) 0.0351 (10) 0.0535 (12) −0.0111 (8) 0.0087 (8) −0.0039 (8)C5 0.0456 (11) 0.0368 (10) 0.0508 (12) −0.0022 (8) 0.0117 (8) 0.0014 (8)C6 0.0474 (11) 0.0526 (12) 0.0368 (10) −0.0045 (9) 0.0021 (8) 0.0038 (8)C7 0.0342 (10) 0.0541 (12) 0.0419 (11) 0.0013 (8) 0.0037 (8) 0.0035 (8)supporting informationsup-3Acta Cryst. (2018). E74, 267-270    Al1 0.0318 (3) 0.0352 (3) 0.0336 (3) −0.0007 (2) 0.0048 (2) 0.00140 (19)Geometric parameters (Å, º) O1—C1 1.462 (2) C3—C4 1.500 (3)O1—C4 1.460 (2) C5—Al1 1.9671 (19)O1—Al1 1.9131 (13) C6—Al1 1.976 (2)C1—C2 1.503 (3) C7—Al1 1.965 (2)C2—C3 1.508 (3)O1—C1—C2 104.49 (15) C5—Al1—C6 116.43 (9)C1—C2—C3 102.38 (16) C5—Al1—C7 116.24 (9)C4—C3—C2 102.87 (16) C6—Al1—C7 114.97 (9)O1—C4—C3 104.82 (15) C1—O1—Al1 122.45 (10)O1—Al1—C5 101.44 (7) C4—O1—Al1 124.00 (11)O1—Al1—C6 102.27 (8) C4—O1—C1 109.40 (13)O1—Al1—C7 101.92 (8)Selected geometric parameters (Å, °). O1–Al1 1.9131 (13)C5–Al1 1.9671 (19)C6–Al1 1.976 (2)C7–Al1 1.965 (2)C5–Al1–C6 116.43 (9)C7–Al1–C5 116.24 (9)C7–Al1–C6 114.97 (9)C1–O1–Al1 122.45 (10)C4–O1–Al1 124.00 (11)C4–O1–C1 109.40 (13)

Crystal structure and quantum-chemical calculations of a tri­methyl­aluminium–THF adduct

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Crystal structure and quantum-chemical calculations of a trimethylaluminium–THF adduct

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Crystal structure and quantum-chemical calculations of a tri­methyl­aluminium–THF adduct

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Crystal structure and quantum-chemical calculations of a trimethylaluminium–THF adduct