In problems 4.28 to 4.51, refer to Table 4.3 for isotopic abundances where needed. (a) Predict the
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In problems 4.28 to 4.51, refer to Table 4.3 for isotopic abundances where needed.
(a) Predict the structure of SF4 using the VSEPR model.
(b) Account for the fact that at 298K and in solution the 19F NMR spectrum of SF4 exhibits a singlet but that at 175 K, two equal-intensity triplets are observed.
Table 4.3
Transcribed Image Text:
Nucleus ΤΗ ²H Li 11B 13C 170 19 F 23 Na 2 Al 29 Si 31 p 7 Se 103 Rh 117. Sn 119 Sn 19 Xe 183 W 195 pt 199 Hg Natural abundance/% >99.9 0.015 92.41 80.1 1.07 0.04 100 100 100 4.69 100 7.63 100 7.68 8.59 26.40 14.31 33.78 16.87 miele v + mk nh -k -le -le-le - -ki -k -k -IN Frequency of observation / MHz (referred to ¹H at 100 MHz) 100 15.35 38.9 32.1 25.1 13.5 94.0 26.45 26.1 19.9 40.5 19.1 3.2 35.6 37.3 27.7 4.2 21.5 17.9 Chemical shift reference (8 0 ppm)* SiMe SiMe4 LICI (1 M in H₂O) F3B-OEt2 SiMe H₂O CFC13 NaCl (1 M in H₂O) [Al(OH₂)]³+ SiMc4 H3PO4 (85%, aq) SeMe₂ Rh (metal) SnMc4 SnMe4 XeOF4 Na₂WO4 (in D₂O) Na₂ [PtCl6] HgMe₂
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a To predict the structure of SF using the VSEPR model Valence Shell Electron Pair Repulsion model we first determine the valence electron count of the sulfur S and fluorine F atoms Sulfur is in group ...View the full answer
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