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• W2024461490 endingPage "1232" @default.
• W2024461490 startingPage "1224" @default.
• W2024461490 abstract "The intrinsic effect of the B1u ruffling (ruf) distortion on the heme vibrational frequencies was evaluated using density functional theory (B3LYP/6-31G(d,p)). Ni(II) porphine (NiP) was constrained for a wide range ruffling angles (τruf = the cross macrocycle Cα−N---N−Cα angle), but otherwise freely geometry optimized, and vibrational frequencies were calculated at each point. This approach allowed the impact of the out-of-plane distortion to be isolated from complicating factors arising from peripheral substituents, the environment, and the metal−macrocycle interaction. The potential energy surface revealed a minimum energy structure at τruf = 22.8° and a small barrier at the planar conformation of 0.162 kcal mol-1. A clear pattern of vibrational shifts driven by the ruffling distortion was observed. Seven degenerate and 17 nondegenerate modes shift by >10 cm-1 upon ruffling by 45°. In general, shifts to lower frequencies were seen for higher frequency modes and vice versa. The in-plane asymmetric Cα−Cm stretches ν10(B1g), ν19(A2g), and ν37(Eu) showed the largest downshifts with ruffling, followed closely by their symmetric counterparts ν3(A1g), ν28(B2g), and ν39(Eu) and the Cβ−Cβ stretches ν2(A1g), ν11(B1g), and ν38(Eu). The Ni−N stretches ν8 and ν18 upshifted significantly, as did some of the in- and out-of-plane pyrrole motions, most notably ν53(Eu) and γ22(Eg). The vibrational shifts were fit excellently by a cos(τruf) function, indicating that the major influence of OOP ruffling upon the vibrational spectrum, and probably porphyrin chemistry and photochemistry as well, is reduced π-overlap." @default.
• W2024461490 created "2016-06-24" @default.
• W2024461490 creator A5050281664 @default.
• W2024461490 creator A5087408485 @default.
• W2024461490 date "2004-01-20" @default.
• W2024461490 modified "2023-09-24" @default.
• W2024461490 title "Isolated Impact of Ruffling on the Vibrational Spectrum of Ni Porphyrins. Diagnosing Out-of-Plane Distortions" @default.
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• W2024461490 doi "https://doi.org/10.1021/jp036880w" @default.
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