P-2

NMR (THF-d8) δ (ppm):

1H: 0.2 (s. -SiMe + -OSiMe3), 0.9 (m. -SiCH2-), 2.7 (m. -CH2S-), 3.3 (m. -SCH2-), 3.5 (NH-CH2- + -CH2-SH), 3.43 (-SH), 8.2 (-NH-)

13C: −0.9 (-SiMe + -OSiMe3), 17.3 (-SiCH2-), 27.2 (-CH2SH), 33.2–35.0 (-SCH2-), 37.0–39.2 (-CH2S-), 40.6 (-NHCH2-), 170.2 (-C(O)NH-), 173.2 (COOH) (residue)

29Si: –23.4, –21.3 (-CH2(Me)SiO2/2), 10.0 (-OSiMe3)

FTIR (cm−1): 3500–3000 (ν O-H), 3287 (ν N-H), 3000–2940 (ν C-H), 2460 (ν S-H), 1700 (ν C=O) (carboxylic groups), 1660 amide I band (ν C=O), 1536 amide II band (δ NH in plane + ν C-N), 1381 (δ C-H), 1261 (δ Si-C), 1169 (δ Si-CH2), 1076 (ν Si-O-Si), 798 (ρ Si-CH3)
