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3. The 'H NMR spectrum of NaBH4 in THF is given below. The integral of the four line pattern to the seven line signals is about 4:1. Assign the spectrum and measure the couplings (print out and use a ruler). Explain the spectrum.(You will need to look up the isotopic composition of boron, the nuclear spin values and the magnetogyric ratios.) 50 HZ slaasten ratio Resonance Natural Nuclear Magnetogyrie Quadruple frequency Relative Absolute Isotope Abundance Spin moment (MH) sensitivity sensitivity (%) (1) (107*rad/ T00280/m2) at 11.744T "H=1.00) ("H=1.00) (500 MHz for 'ht) 10B 19.58 3 2.875 8.5*10-2 53.732 1.99*102 3,93103 HB 80.42 3/2 8.584 4.1*10-2 160,419 0.17 0.13