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. Author manuscript; available in PMC: 2013 Feb 20.

Published in final edited form as: Inorg Chem. 2012 Feb 8;51(4):2086–2096. doi: 10.1021/ic2017819

Panel a. A comparison of: (○), the K-edge XAS of 0.10 M copper(II) in 4 M imidazole liquid aqueous solution; ( ), the axially elongated (O_ax=2.17 Å) square pyramidal MXAN fit with a distal O_ax scatterer at 3.1 Å, and; ( ), the analogous fit (O_ax=2.28 Å) without the distal O_ax scatterer. Panel b. The second derivatives of: (-○-), the K-edge XAS spectrum of 0.10 M Cu(II) in 4 M aqueous imidazole; ( ) the axially elongated square pyramid with the distal scatterer, and; ( ), the axially elongated square pyramid alone. The arrows show where the 3.1 Å axial scatterer contributed a feature to the rising edge shoulder.

Inline graphic — Panel a. A comparison of: (○), the K-edge XAS of 0.10 M copper(II) in 4 M imidazole liquid aqueous solution; ( ), the axially elongated (O_ax=2.17 Å) square pyramidal MXAN fit with a distal O_ax scatterer at 3.1 Å, and; ( ), the analogous fit (O_ax=2.28 Å) without the distal O_ax scatterer. Panel b. The second derivatives of: (-○-), the K-edge XAS spectrum of 0.10 M Cu(II) in 4 M aqueous imidazole; ( ) the axially elongated square pyramid with the distal scatterer, and; ( ), the axially elongated square pyramid alone. The arrows show where the 3.1 Å axial scatterer contributed a feature to the rising edge shoulder.