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- W2016395840 abstract "Abstract Ditungsten hexapivalate, W 2 (O 2 CBu t ) 6 , and triethyloxonium tetrafluoroborate, Et 3 O + BF 4 − , react in CH 2 Cl 2 at room temperature to yield the 1:1 complex [W 2 (O 2 CBu t ) 5 ][BF 4 ] ( 1 ), as a yellow crystalline solid. A similar reaction involving trimethylsilyltrifluoromethane-sulfonate, TMS-OTf, yields [W 2 (O 2 CBu t ) 5 ][OTf] ( 2 ). Compounds 1 and 2 are 1:1 electrolytes in CH 3 CN but show ion pairing in THF and CH 2 Cl 2 solutions with the degree of ion pairing being greater for 2 than for 1 . Only 1 is soluble in toluene. 1 H NMR spectroscopy shows there are 3 types of O 2 CBu t ligands in the integral ratio 1:2:2 which is consistent with the structure found in the solid state for 1 which has a (WW) 6+ unit, WW=2.28(1) A supported by three bridging pivalates and two chelating η 2 -O 2 CBu t ligands. The local geometry about each tungsten is a distorted pentagonal pyramid, WWO 5 , with relatively weak axial interactions ( trans to the WW bond) to the BF 4 − counter anions, WF=2.50(1) A (av.). This leads to an infinite polymeric structure in the solid state. Crystal data for (W 2 (O 2 CBu t ) 5 ][BF 4 ] at −171 °C: a =29.44(1), b =36.05(1), c =20.80(1) A, β=133.30(1)°, Z =16, D calc =1.82 g cm −3 and space group C 2/ c ." @default.
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- W2016395840 title "Cationic d3-d3 dinuclear compounds of tungsten: [W2(O2CBut)5]+X−, where X−=BF4− and CF3SO3−" @default.
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- W2016395840 doi "https://doi.org/10.1016/s0020-1693(00)83824-4" @default.
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