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. 2020 Sep 14;59(19):14000–14011. doi: 10.1021/acs.inorgchem.0c01773

Table 3. Spectroscopic Parameters for Cu(II) Mono-complexes of Aβ_5–x Peptides at 25 °C.

		UV–vis	CD
Complex	Mode (species)	λ_max/nm (ε/M^–1 cm^–1)	λ_ext/nm (Δε/M^–1 cm^–1)
Cu(II)-Aβ_5–9	3N+H₂O (CuL + CuH_–1L)	600 (47)^a	600 (+0.17)^a
			505 (−0.05)^a
			341 (+0.12)^b
			300 (−0.46)^c
			267 (+0.53)^d
	3N+OH^– (CuH_–2L)	555 (63)^a	650 (−0.1)^a
			546 (+0.61)^a
			470 (−0.11)^a
			325 (+0.38)^b,^c
			285 (−0.76)^d
Cu(II)-Aβ_5–12	3N+H₂O (CuH₂L+CuHL+CuL)	600 (60)^a	600 (+0.14)^a
			503 (−0.05)^a
			341 (+0.09)^b
			301 (−0.37)^c
	3N/Tyr10 and 3N+OH^– (CuH_–1L)	560 (89)^a	650 (−0.09)^a
		400sh (82)^e	548 (+0.29)^a
			470 (−0.09)^a
			400 (+0.09)^e
			325 (+0.25)^b
Cu(II)-Aβ_5–12F	3N+H₂O	600 (60)^a	605 (+0.16)^a
			513 (−0.05)^a
			341 (+0.08)^b
			301 (−0.39)^c
	3N+OH^–	555 (85)^a	650 (−0.08)^a
			553 (+0.44)^a
			470 (−0.09)^a
			323 (+0.28)^b,^c
			283 (−0.64)^d
Cu(II)-Aβ_5–16	3N+H₂O (CuH₅L+CuH₄L+CuH₃L)	600 (58)^a	605 (+0.19)^a
			506 (−0.05)^a
			341 (+0.11)^b
			301 (−0.47)^c
	3N+N (CuH₂L+ CuHL)	565 (66)^a	640 (−0.05)^a
			553 (+0.16)^a
			478 (−0.09)^a
			336 (+0.12)^b
			300 (−0.35)^c
	3N+OH^– (CuL+CuH-₁L+CuH_–₂L)	560 (73)^a	640 (−0.07)^a
			553 (+0.20)^a
			478 (−0.10)^a
			336 (+0.17)^b,^c

^a

d–d transition.

^b

N^im–Cu^II charge transfer (CT).

^c

N^––Cu^II CT.

^d

N^am–Cu^II CT.

^e

Tyr O^––Cu^II CT.