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• W2099840038 abstract "Vapor absorption in the range 800-200 mμ are given for porphin, free-base tetraphenylporphin (H2TPP), and the Mg, Cr(III), Mn(III), Fe(III), Co, Ni, Cu, Zn, Cd, Sn(IV), and PbTPP complexes. Electronic bands Q, B, and M characteristic of the ring are found in the regions 540 mμ (18 500 cm−1), 405 mμ (24 700 cm−1), and 205 mμ (48 800 cm−1). The region between the B and the M shows rather unstructured absorption, an order of magnitude less intense than the B region. Based on spectroscopic measurements, the ΔH of vaporization and absolute vapor pressures are calculated. The pressures average to ∼0.05 Torr at 390°C. Vacuum uv spectra of H2TPP, NiTPP, CuTPP, and ZnTPP down to 145 mμ are presented which show absorption across the entire range with more intense bands at 185 mμ (54 000 cm−1), 164 mμ (61 000 cm−1), and 150 mμ (67 000 cm−1), and no evidence of Rydberg structure. The vapors of Cr, Mn, Fe, and Sn complexes show unusually different spectra from their solutions. Spectral changes on electrolytic reduction establish that in the Mn, Fe, and Sn cases the vapors are those of the divalent metal. Solution spectra of H2TPP, CuTPP, and FeClTPP were studied up to 300°C. Broadening comparable to the vapor spectra is observed. Also the visible bands shift to the red while the Soret band shows no change." @default.
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• W2099840038 date "1971-04-01" @default.
• W2099840038 modified "2023-10-14" @default.
• W2099840038 title "Porphyrins XVII. Vapor absorption spectra and redox reactions: Tetraphenylporphins and porphin" @default.
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• W2099840038 doi "https://doi.org/10.1016/0022-2852(71)90090-7" @default.
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