The crystal and molecular structure of 2,3,7,8,12,13,17,18-octaethylporphinatomonopyridinezinc(II)

Cullen, David L.; Meyer, Edgar F.

doi:10.1107/s0567740876007565

Cited by 61 publications

(25 citation statements)

References 10 publications

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“…Although the Zn H and Pd H complexes are structurally similar, the chemical reactivity of the former complex resembles that of Ni H. It may well be, however, that in the presence of hydroxide ion (the added base) Zn ~ becomes pentacoordinate, causing the porphyrin to become nonplanar. This is consistent with previously reported structures of ZnX~-porphyrins in the presence of added ligands (Bobrik & Walker, 1980;Collins & Hoard, 1970;Cullen & Meyer, 1976).…”

Section: [(H30)(ceoh36ot)] 2[th(no3)6isupporting

confidence: 82%

The structure of the palladium(II) and zinc(II) complexes of α,β,γ,δ-tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)porphyrin

Golder¹,

Nolan²,

Povey³

et al. 1988

Acta Crystallogr C

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[(H30)(CEoH36Ot)] 2[Th(NO3)6IThe complex anion is surrounded by six complex cations where the distances between oxonium ions and Th atoms are 7.78-8.38 A. Besides Coulomb forces, there are van der Waals forces among complex anions and cations. The crystal is stabilized by these forces. The present structure suggests that the process of extraction of thorium(IV) from nitric acid solution with dicyclohexano-18-crown-6 isomer A in 1,2-dichloroethane is described as Acta Cryst. (1988). C44, 1916-1921The readily lost from the lattice, destroying the order. The structures also show excellent pseudo-orthorhombic symmetry which made the structure solution nontrivial.

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Section: [(H30)(ceoh36ot)] 2[th(no3)6isupporting

confidence: 82%

The structure of the palladium(II) and zinc(II) complexes of α,β,γ,δ-tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)porphyrin

Golder¹,

Nolan²,

Povey³

et al. 1988

Acta Crystallogr C

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“…Overall, both molecules exhibit a very similar pattern in their bond lengths and bond angles (Tables III and IV). The bond distances to the axial pyridine Z n -N ax are 2.131(5) and 2.121 (5) Ä, respectively, and com pare well with those found in other zinc(II) tetrapyrroles with a pyridine as the fifth, axial ligand [2a, [12][13][14][15][16]. The orientation of the pyridine plane with respect to a N -N axis has been suggested as an im portant structural charac teristic for such com pounds [17].…”

Section: Resultssupporting

confidence: 49%

Metal Complexes of Dioxo-porphyrins-Zinc(II) Complexes of 2,3,7,8,12,13,17,18-Octaethyl-5,15-dioxo-porphyrin and 5,15-Dioxo-etioporphyrin I

Senge

1993

Zeitschrift Für Naturforschung B

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The crystal structures of two zinc(II) 5,15-dioxo-porphyrins (porphodimethenes) have been determined to investigate the coordination chemistry of porphyrins with interrupted conjuga tion system. Both com pounds have a five-coordinated zinc center with pyridine as axial ligand and show overall structural parameters very similar to porphyrins. The oxidized meso-posi tions are, however, easily identified by longer Cm-C a bond lengths and smaller Ca-C m-C a angles. The macrocycles exhibit a small degree of conform ational distortion, and the etiopor-

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“…This axial value lies at the upper range of Zn-Npy distances found in other pyridine-ligated Zn porphyrins [28,34,35]. Here, the pyridine is constrained by symmetry to lie perpendicular to the plane of the pyrrole nitrogens and almost eclipses the N1-Zn-N1 axis: it is twisted 5°off that axis.…”

Section: Resultsmentioning

confidence: 94%

Electrosynthesis, electrochemistry, and crystal structure of the tetracationic Zn-meso-tetrapyridiniumyl-β-octaethylporphyrin

Giraudeau¹,

Lobstein²,

Ruhlmann

et al. 2001

J. Porphyrins Phthalocyanines

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ABSTRACT:Exhaustive electro-oxidation of ZnOEP in the presence of pyridine and Et 4 NPF 6 affords in high yield the new tetracationic porphyrin in which the four meso protons of ZnOEP are replaced by four pyridinium groups linked via their nitrogens: 10,15,3,7,8,12,13,17, 4 PF À 6 4 , 1. The compound has been characterized by elemental analysis, 1 H NMR, and crystallography. The latter confirms the preparative electrosynthetic methodology and molecular structure of 1, and shows the porphyrin skeleton to adopt a severely nonplanar saddle conformation which minimizes steric crowding between the 12 peripheral substituents. As a consequence of the nonplanarity (and the high charge) of the complex, 1 exhibits significant redshifts of the visible and Soret bands as well as a considerable broadening and loss of intensity of the latter. 1 first undergoes four one-electron reduction steps at the four pyridinium sites before the normal one-electron reduction of the porphyrin p-system.

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The crystal and molecular structure of 2,3,7,8,12,13,17,18-octaethylporphinatomonopyridinezinc(II)

Cited by 61 publications

References 10 publications

The structure of the palladium(II) and zinc(II) complexes of α,β,γ,δ-tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)porphyrin

The structure of the palladium(II) and zinc(II) complexes of α,β,γ,δ-tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)porphyrin

Metal Complexes of Dioxo-porphyrins-Zinc(II) Complexes of 2,3,7,8,12,13,17,18-Octaethyl-5,15-dioxo-porphyrin and 5,15-Dioxo-etioporphyrin I

Electrosynthesis, electrochemistry, and crystal structure of the tetracationic Zn-meso-tetrapyridiniumyl-β-octaethylporphyrin

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