These IR spectrum values can be interpreted by FTIR reference spectrum charts,  easily available

Reminder :

IR spectra were recorded on a Perkin-

Elmer 1430, MIDAC M2000, or JASCO FT/IR-410 spectrometer.

Consulting FTIR table is your first step, however, when it comes to inorganic molecule you need consider a few parameters interpret specially the fingerprint regions.Solvent, humudity are a few the exaples. From the FTIR you stated, it is very straight forward to interpret the spectra.For example,  2966, 2937 -CH3 and CH2 anti & sym of CH str.

850 C-Cl str. and 1559 is probably due to the ring str. etc

Note

- IR spectrum

The IR spectrum shows frequencies which can also be seen in the spectrum of pyridine, namely the

slightly split band for the C=C vibration at 1600 cm–1 and the bands at 700 and 800 cm–1. The aliphatic

part of the molecule is present in the very strong CH valence vibrations from 3000 to 2800 cm–1

Generally peaks from 2966 to 2779 are due to sp3 and sp2 hyberdized CH respectively

As for : (S)-4–Iodonicotine (117): mp 97-98 °C;1H NMR (400 MHz,CDCl3) δ 8.60 (s, 1H), 8.04 (d, 1H, J = 5.2 Hz), 7.70 (d, 1H, J = 5.2 Hz), 3.38 (t, 1H, J = 8.4

Hz), 3.27 (dt, 1H, J = 2.0 Hz, J = 8.2 Hz), 2.46-2.32 (m, 2H), 2.24 (s, 3H), 1.98-1.78 (m,2H), 1.58-1.46 (m, 1H).

* 13C NMR (100 MHz, CDCl3) δ 149.8, 148.4, 141.9, 134.3, 111.4,72.5, 57.1, 40.8, 33.9, 22.9

As for : (S)-6-Iodonicotine ; IR (neat): 2966, 2943, 2778, 1573,1555, 1447, 1325, 1070 cm-1; 1H NMR (400 MHz, CDCl3) δ 8.28 (d, J = 2.8 Hz, 1H), 7.67(d, J = 8.4 Hz, 1H), 7.35 (dd, J = 2.8, 2.8 Hz, 1H), 3.22 (dt, J = 2.0, 8.6 Hz, 1H), 3.03 (t, J =8.4 Hz, 1H), 2.29 (q, J = 9.2 Hz, 1H), 2.23-2.19 (m, 1H), 2.15 (s, 3H), 2.00-1.88 (m, 1H),1.86- 1.76 (m, 1H), 1.70-1.60 (m, 1H); 13C NMR (100 MHz, CDCl3) δ 150.7, 139.1, 137.1,135.1, 116.4, 68.4, 57.2, 40.6, 35.6, 22.9

As for : (S)-2- Iodonicotine ; IR (neat) 2965,2940, 2778, 1568, 1550, 1446, 1395, 1330, 1034, 805 cm-1; 1H NMR (300 MHz, CDCl3) δ 8.22 (dd, 1H, J = 4.6, 2.0 Hz), 7.74 (dd, 1H, J = 7.6, 2.0 Hz), 7.24 (dd, 1H, J = 7.6, 4.6 Hz),3.35 (t, 1H, J = 8.4 Hz), 3.25 (t, 1H, J = 8.4 Hz), 2.50-2.36 (m, 2H), 2.21 (s, 3H), 1.84-1.80 (m, 3H), 1.52-1.42 (m, 1H); 13C NMR (100 MHz, CDCl3) δ 149.4, 143.1, 137.1, 135.9,123.7 ,72.4 ,57.1, 40.7, 33.9, 23.0

And on the other hand we have : (S)-2-chloro-5-(1-methyl-pyrrolidin-2-yl)pyridine ( (S)-2-chloronicotine ) ;IR (neat) 2969, 2943,2809, 2779, 1584, 1573, 1567, 1454, 1104 cm-1.

2-Iodonicotine and 4-Iodonicotine .

Under an atmosphere of argon, 2,2,6,6-tetramethylpiperidine (370 μL, 2.2 mmol, 1.1 equiv) in dry THF (5 mL) was cooled to – 78 °C and treated with n-butyllithium (2.0 mmol, 1.0 equiv). The solution was stirred at 0 °C for 30 min, then the mixture was cooled to – 78 °C and treated with di-t-butylzinc (2.4 mmol, 1.2 equiv), prepared from zinc chloride (4.8 mL, 0.5 M in THF, 2.4 mmol) and t-butyllithium (4.8 mmol, 2.4 equiv). The mixture was then stirred at room temperature for 1 h. (S)-Nicotine (320 μL, 2.0 mmol, 1.0 equiv) was added dropwise at room temperature, and the mixture was stirred overnight. Iodine (2.03 g, 8.0 mmol, 4.0 equiv) was added to the reaction mixture. The flask was wrapped by aluminum foil to protect the reaction from light. The reaction was quenched with 1.0 mL of a saturated aqueous solution of sodium bicarbonate. The cold aqueous layer was extracted with methylene chloride, and the combined organic layers were dried over magnesium sulfate. The solvent was removed by evaporation to afford a yellow oil. The product was purified by radial PLC (silica gel, 1% TEA/hexanes). (S)-2-Iodonicotine was obtained in a 19 % yield (107 mg) as a light yellow oil, and (S)-4-Iodonicotine was obtained in a 24 % yield (139 mg) as a white solid .

Check the FTIR reference spectrum charts