“…The larger interaction by the PE criterion of larger An(unsat) -An(sat) for 10 than 4 (Scheme III) is corroborated by consideration of Xmax for the -* * UV band of these compounds. 20 Lehn and co-workers report an n-*-r* band at 266 nm (e 680) for 4 in cyclohexane,20 whereas 2 only shows an inflection point near 270 nm. 5 The -+ * band for 10 appears as a distinct maximum, Xmax 300 nm (e 710) in hexane.…”
“…The larger interaction by the PE criterion of larger An(unsat) -An(sat) for 10 than 4 (Scheme III) is corroborated by consideration of Xmax for the -* * UV band of these compounds. 20 Lehn and co-workers report an n-*-r* band at 266 nm (e 680) for 4 in cyclohexane,20 whereas 2 only shows an inflection point near 270 nm. 5 The -+ * band for 10 appears as a distinct maximum, Xmax 300 nm (e 710) in hexane.…”
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