Photochemical Formation of the Anion Radical of Zinc Phthalocyanine and Analysis of the Absorption and Magnetic Circular Dichroism Spectral Data. Assignment of the Optical Spectrum of [ZnPc(-3)]-

1994 ◽  
Vol 116 (4) ◽  
pp. 1292-1304 ◽  
Author(s):  
John Mack ◽  
Martin J. Stillman
Keyword(s):  
Circular Dichroism ◽  
Spectral Data ◽  
Anion Radical ◽  
Optical Spectrum ◽  
Magnetic Circular Dichroism ◽  
Zinc Phthalocyanine ◽  
Photochemical Formation ◽  
Circular Dichroïsm

Assignment of the optical spectrum of metal porphyrin and phthalocyanine radical anions

2001 ◽  
Vol 05 (01) ◽  
pp. 67-76 ◽  
Author(s):  
JOHN MACK ◽  
MARTIN J. STILLMAN
Keyword(s):  
Circular Dichroism ◽  
Radical Anion ◽  
Optical Spectrum ◽  
Magnetic Circular Dichroism ◽  
Spectral Band ◽  
Metal Porphyrin ◽  
Radical Species ◽  
Weak Absorption Band ◽  
Magnetic Circular Dichroism Spectrum ◽  
Circular Dichroïsm

The approach developed previously to assign the major π → π* and π* → π* bands in the optical spectra of metallophthalocyanine radical species [ MPc (−n)](n−2)− (n = 1–6), which was based on spectral band deconvolution analyses of the UV-vis absorption and magnetic circular dichroism (MCD) spectra and ZINDO calculations, is reviewed in this paper and extended to the major bands observed in the spectrum of the zinc tetraphenylporphyrin radical anion [ ZnTPP (−3)]−. The magnetic circular dichroism spectrum is dominated by an intense pseudo A term associated with the B (or Soret) transition with bands at 445 and 465 nm. Weaker bands associated with the π* → π* transition out of the partially filled LUMO give rise to two widely separated, oppositely signed, coupled B terms in the MCD spectrum at 538 and 910 nm. The Q transition is assigned to a weak absorption band at 750 nm and a shoulder slightly to the blue at 728 nm.

Magnetic circular dichroism and absorption spectrum of zinc phthalocyanine in an argon matrix between 14700 and 74000 cm-1

1989 ◽  
Vol 93 (8) ◽  
pp. 2999-3011 ◽  
Author(s):  
Thomas C. Van Cott ◽  
Janna L. Rose ◽  
G. Christian Misener ◽  
Bryce E. Williamson ◽  
Andreas E. Schrimpf ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Circular Dichroism ◽  
Magnetic Circular Dichroism ◽  
Zinc Phthalocyanine ◽  
Argon Matrix ◽  
Circular Dichroïsm

Absorption and magnetic circular dichroism spectra of nitrogen homologues of magnesium and zinc phthalocyanine

1993 ◽  
Vol 71 (11) ◽  
pp. 1898-1909 ◽  
Author(s):  
Edward A. Ough ◽  
Martin J. Stillman ◽  
Katherine A.M. Creber
Keyword(s):  
Circular Dichroism ◽  
Magnetic Circular Dichroism ◽  
Electron System ◽  
Zinc Phthalocyanine ◽  
Zero Field ◽  
Molecular Symmetry ◽  
Zero Field Splitting ◽  
Benzene Rings ◽  
Circular Dichroïsm ◽  
Magnetic Circular Dichroism Spectra

Absorption and magnetic circular dichroism (MCD) spectra are reported for the metallophthalocyanine-N-isologs: magnesium-3,4-pyridinoporphrazine (MgPcN4(−2)), zinc-3,4-pyridinoporphyrazine (ZnPcN4(−2)), and zinc-3,4-pyridazinoporphyrazine (ZnPcN8(−2)). Band deconvolution calculations, which couple both the absorption and the MCD spectra, are reported for each complex. The presence of the peripherally fused pyridine rings in MgPN4(−2) and ZnPcN4(−2) reduces the molecular symmetry and splits the degenerate Q band into its x and y components with zero field splitting parameters (ΔQxy) of 224 and 279 cm−1, respectively. Band fitting results for ZnPcN8(−2) show that with the fused pyridazine rings the degeneracy in the 1Eg excited state is retained and the MCD envelope in the region of the Q00 transition can be described by an MCD A term. Comparison of the fitted band energies with the results reported for ZnPc(−2) (T. Nyokong, Z. Gasyna, and M.J. Stillman. Inorg. Chem. 26, 1087 (1987)) and MgPc(−2) (E.A. Ough, T. Nyokong, K.A.M. Creber, and M.J. Stillman. Inorg. Chem. 27, 2725 (1988)) shows that as the number of nitrogens substituted increases from 0 to 8, the Q band blue shifts from 671 nm in ZnPc(−2) to 664 nm in ZnPcN4(−2) (midpoint between the x and y components) to 654 nm in ZnPcN8(−2) and from 672 nm in MgPc(−2) to 666 nm in MgPcN4(−2) (midpoint). These results demonstrate that chemical modification (symmetric and asymmetric) of the peripherally fused benzene rings influences both the energy and the symmetry of the states that form the inner 18-π-electron system.

scholarly journals Soft x-ray absorption spectroscopy and magnetic circular dichroism as operando probes of complex oxide electrolyte gate transistors

2020 ◽  
Vol 116 (20) ◽  
pp. 201905
Author(s):  
Biqiong Yu ◽  
Guichuan Yu ◽  
Jeff Walter ◽  
Vipul Chaturvedi ◽  
Joseph Gotchnik ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Absorption Spectroscopy ◽  
Magnetic Circular Dichroism ◽  
Complex Oxide ◽  
X Ray ◽  
X Ray Absorption ◽  
Circular Dichroïsm ◽  
Oxide Electrolyte
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