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. Author manuscript; available in PMC: 2012 Dec 26.
Published in final edited form as: Org Biomol Chem. 2010 Sep 6;8(23):5431–5441. doi: 10.1039/c0ob00482k

Table 2.

Positions (λabs ) and molar absorptivities (ε) of the lowest energy absorption bands of both free ligands and their Zn2+ complexes in CH3 CN.a The Zn2+-induced absorption band shifts (Δνabs/cm−1) are shown on the right along with the calculated HOMO–LUMO transition oscillator strengths (f )

ligand λabs (L)/nm ε(L)/cm−1M−1 λabs (ZnL)/nm ε(ZnL)/mol−1cm−1 Δνabs/cm−1 f (HOMO–LUMO)
3 336 45 685 348 35 655 1026 1.4
4 412 54 545 430 34 805 1016 1.8
2a 340 44 911 348 30 558 676 0.2
2b 418 53 968 436 35 979 988 1.4
a

L: free ligand; ZnL: Zn(II) complex.