Fig. 6: Additional charge-transfer bands observed with differing triarylphosphines.
From: Quantifying interactions in the active encounter complex of frustrated Lewis pairs
a Increasing methylation of the basic triarylphosphines and their associated CT bands when mixed with B(C6F5)3 in a 10:1 (P:B) ratio, i: P(o-tol)3, ii: P(xyl)3, iii: P(mes)3, iv: P(dur)3, v P(C6Me5)3. b The encounter complex formed between P(dur)3 and B(C6F5)3 with the increase in [P(dur)3] leading to an increase in absorbance.
