Vibrational studies of nickel porphins and octaethyl porphyrins
The in-plane vibrational frequencies and assignments of nickel porphin (NiP) and octaethyl porphyrin (NiOEP) and their isotopically substituted derivatives are obtained by using Urey-Bradley potential energy constants. In order to study the core size effects in metallooctaethyl porphyrin (MOEP) systems, the (C∝–Cm) stretching force constants of Co, Cu and ZnOEP are also determined. Structural correlations between these constants and (1) centre-to-pyrrole nitrogen distances and (2) resonance Raman skeletal mode frequencies above 1450cm−1 (v2,v3,v10,v11 andv19) indicate the porphyrin core size influence on the (C∝−Cm) stretching force constants and the skeletal mode frequencies.
Volume 134, 2022
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