Table 1. Spectroscopic parameters and the obtained dihedral angles of AYA peptides.

AXA	RIR	Riso	Raniso	ρ+	ρ-	ϕ,o	ψ,o
AAA†	1.52†	0.48†	1.14†	0.22†	0.13†	–120 + 7/–3†	164 + 7/–2†
AFA	1.52	0.46	0.88	0.21	0.13	–140 ± 15	170 ± 10
AGA	1.35	0.34	1.31	0.23	0.08	–105 ± 20	170 ± 10
AMA	1.35	0.45	1.16	0.19	0.09	–110 ± 10†	170 ± 10†
AHA‡	1.8	0.2	1.14	0.35	0.13	–160 ± 10	140 ± 10
AHA§	1.55	0.56	0.94	0.25	0.15	–130 ± 10	170 ± 10
AVA¶	—	0.51	0.93	0.2	0.12	–165 ± 5	140 ± 5
AKA‡	1.64	0.53	(0.6)?	0.08	0.07	–155 ± 10	145 ± 10
AKA§	1.16	0.42	1.06	0.16	0.17	–55 ± 10	150 ± 20
ALA	1.45	0.5	1.02	0.29	0.18	–125 ± 5	170 ± 10
AYA§	1.15	0.38	4.0	0.34	0.05	–70 ± 10	150 ± 10
APA∥	1.2	0.8	1.05	0.18	0.15	–75 ± 5	150 ± 5
AWA§	1.5	0.38	(0.5)*	0.25	0.13	–170 ± 10**	150 ± 20**
ASA	1.75	0.3	0.7	0.38	0.23	–130 ± 10	178 ± 20

^†Taken from ref. 18

^‡Zwitterionic

^§Cationic

^¶R_IR could not be determined because of a strong spectral contamination from the 1,676 cm^-1 band of TFA, which could not be eliminated

^∥Anionic

^**The dihedral angles reflect a combined analysis of the Raman and VCD spectra