Metal Halide Complexes of o-Quinones. I. Preparation and Preliminary Characterization

Crowley, Paul J.; Haendler, Helmut M.

doi:10.1021/ic50004a042

Cited by 45 publications

(17 citation statements)

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“…This is in agreement with reported metal complexes of o-quinone ligands, where upon complexation the C=O stretching band generally moves to lower frequency than the 1700 cm -1 observed for free quinones. 22 The bands at ca. 1480 cm -1 and 1250-1300 cm -1 can be assigned to the C-C ring and C-O stretching of the catecholate ligands, as reported for similar complexes.…”

Section: Infrared Spectroscopymentioning

confidence: 99%

Solvation effects on the valence tautomeric transition of a cobalt complex in the solid state

et al. 2010

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A detailed investigation of a valence tautomeric (VT) transition for the new complex [Co(III)(3,5-DBCat)(3,5-DBSQ)(py)₂]/[Co(II)(3,5-DBSQ)₂(py)₂] (1) is reported, where 3,5-DBCatH₂ is 3,5-di-tert-butyl-catechol, 3,5-DBSQH is 3,5-di-tert-butyl-semiquinone and py is pyridine. Complex 1 exists as a mixture of the two valence tautomers, with the relative proportion of each depending on the external conditions. Three differently solvated forms of the complex have been synthesized and variable temperature structural and magnetic investigations of one of these, 1·0.5py, reveals that this compound undergoes a thermally-induced VT transition from the [Co(III)(3,5-DBCat)(3,5-DBSQ)(py)₂] tautomer at temperatures below 150 K to a 1 : 1 mixture of the two tautomers at temperatures above 300 K. The VT transition may also be photo-induced at 9 K, affording a similar mixture of the two tautomers. In both cases the incomplete transition is attributed to the presence of π-π stacking interactions between the pyridine molecules of solvation and one of the two crystallographically independent complex molecules, which inhibits the expansion of this molecule that would accompany a VT transition. Studies on alternatively solvated forms 1·2MeCN and 1·1.67hexane also suggest a significant dependence of the VT transition on solvation-induced packing effects and/or intermolecular interactions.

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Section: Infrared Spectroscopymentioning

confidence: 99%

Solvation effects on the valence tautomeric transition of a cobalt complex in the solid state

et al. 2010

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“…Closest intermolecular contacts along the screw axis occur C1( 1) with separations of 3.34 and 3.37 A to carbonyl car s C(1) and C(2) of the adjacent molecule ( Figure 2). Chlorine Cl(2) interacts weakly with ring carbons C (9) and C (14) of the lower molecule in Tables containing positional a n d thermal parameters for hydrogen atoms of t h e structure a n d a listing of structure factor amplitudes (16 pages). Ordering information is given on any current masthead page.…”

Section: Description Of the ~~R~~t~r~mentioning

confidence: 99%

.omicron.-Quinone coordination to cis-dioxomolybdenum(VI) species. Crystal and molecular structure of cis-dioxodichloro(9,10-phenanthrenequinone)molybdenum(VI)

Pierpont¹,

Downs²

1977

Inorg. Chem.

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“…For 3,5-di-^-butyl-oquinone this band appears at 1655 cm -1 as an evaporated film on KBr. Cowley and Haendler have reported a number of quinone complexes of transition metals and have observed the C=0 stretching frequencies to lie at from 10-65 cm -1 to lower frequency from that for the free quinone [13]. The complexes reported here show neither the characteristic C=O nor the C-0 vibration but rather a strong vibration at an intermediate energy (1455 cm -1 for Fe(DBSQ)3 and 1430 cm -1 for Cr(DBSQ)3) as expected for a C_0 mode present in the intermediate o-semiquonone oxidation state.…”

Section: Tris(35-di-^-butyl-o-semiquinato)chromium(iii)mentioning

confidence: 99%

Preparation and Properties of Two Tris o-Semiquinone Complexes

Brown

Johnson

1979

Zeitschrift Für Naturforschung B

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Abstract Tris o-benzosemiquinone complexes of iron and chromium are reported. These complexes contain three 3,5-di-t-butyl-o-semiquinato ligands and a trivalent metal ion. The iron complex can be obtained from either the more highly oxidized o-quinone or reduced catechol dianion precursor. The coordinated o-semiquinone ligand is surprisingly stable. A simple infrared criterion is suggested for detecting the presence of a coordinated o-semiquinone.

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Metal Halide Complexes of o-Quinones. I. Preparation and Preliminary Characterization

Cited by 45 publications

References 0 publications

Solvation effects on the valence tautomeric transition of a cobalt complex in the solid state

Solvation effects on the valence tautomeric transition of a cobalt complex in the solid state

.omicron.-Quinone coordination to cis-dioxomolybdenum(VI) species. Crystal and molecular structure of cis-dioxodichloro(9,10-phenanthrenequinone)molybdenum(VI)

Preparation and Properties of Two Tris o-Semiquinone Complexes

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