NaBH4 contains the tetrahedral [BH4]– ion. Although NaBH4 hydrolyses slowly in water, it i...

NaBH4 contains the tetrahedral [BH4]– ion. Although NaBH4 hydrolyses slowly in water, it is possible to obtain a clean 1H NMR spectrum of the compound in D20. Naturally occurring boron consists of two isotopes: 11B, 80.1%, , and 10B, 19.9%, I = 3. Assuming that a sharp, well-resolved spectrum is obtained, sketch the expected 400 MHz 1H NMR spectrum (including a scale) if the signal for the protons occurs at ' δ—0.2 ppm, and the values of J11B1H =80.5 Hz and J10B1H = 27.1 Hz. How would the spectrum differ if it were recorded at 100 MHz?