CHM3122 IR problems Nov17

CHM3122 IR problems Nov17 - IR Lecture 4 problem 1 H (cm-1)...

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1 IR Lecture 4 problem 1 ν (cm -1 ) assignment 3314 (s) 2850-3000 (s) 2126 (m) [1463 (s)] 637 (s) sp ν ( C-H) sp 3 ν (C-H) ν (C C) C-H bend (sym, asym, CH 3 and CH 2 ) C-H bend fundamental - strong; expect to see an overtone (first harmonic) at ca. 1240 H
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2 IR Lecture 4 problem 2 ν (cm -1 ) assignment 3329 (vs, br) 3036 (m) 2882-2936 (m) 1501, 1455 (m) 707, 745 (s) ν (O-H), H-bonded sp 2 ν (C-H) sp 3 ν (C-H ν (C=C) lower energy (weakened by conjugation) C-H, C=C oop bend; monosubstituted ring (expect 750, 690) 1670-2000 (w) aromatic overtones and combination bands ν (C-O) OH
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3 IR Lecture 4 problem 3 ν (cm -1 ) assignment 3244, br 3052, obscured 2800-3000 1601, 1501. .. 753, 699 ν (O-H), H-bonded sp2 ν (C-H)? ?no sp 3 ν (C-H)? hard to say, region obscured ν (C=C) weakened by conjugation C-H, C=C oop bend; monosubstituted ring (expect 750, 690) spectrum taken as melt O H
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4 IR Lecture 4 problem 4 ν (cm -1 ) assignment 3067, 3005 2959, 2843 1601, 1501. .. 761, 699 sp 2 ν (C-H) sp 3 ν (C-H) ν (C=C) weakened by conjugation C-H, C=C oop bend; monosubstituted ring (expect 750, 690) asym ν (C-O-C) 1254 O
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CHM3122 IR problems Nov17 - IR Lecture 4 problem 1 H (cm-1)...

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