The Infra-red Spectra of Some Inorganic Azide Compounds.

Agrell, Ingela; Klæboe, P.; Pettersson, Bente; Svensson, Sigfrid; Koskikallio, Jouko; Kachi, Sukeji

doi:10.3891/acta.chem.scand.25-2965

Cited by 57 publications

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“…Table I shows the positions of the absorption bands obtained in these measurements. The comparison of the position of the absorption band of crystalline CdO is very close to the spectra reported by Nyquist and Kagel [11]. The CdO fundamental frequency lies somewhere towards higher frequencies and there is no bond vibration in the range 400 to 400 cm -1 arising from an ionic character such as for NaC1.…”

Section: Results and Discussion For Cadmium Phosphate Glassessupporting

confidence: 55%

The infrared spectra of CdO-P2O5 and CdO-ZnO-P2O5 glasses

Ghauri

Hogarth

1984

J Mater Sci

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The infrared absorption spectra of cadmium phosphate and cadmium zinc phosphate glasses were measured. The structure of cadmium phosphate glasses was found analogous to cadmium zinc phosphate glasses at 30% of ZnO but a further decrease in ZnO content causes a 30 to 40 cm -1 change towards higher wave number of the absorption band at the stretching frequency. Annealing at different temperatures does not show a prominent change in absorption band positions.

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Section: Results and Discussion For Cadmium Phosphate Glassessupporting

confidence: 55%

The infrared spectra of CdO-P2O5 and CdO-ZnO-P2O5 glasses

Ghauri

Hogarth

1984

J Mater Sci

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“…The azide antisymmetric stretching band has been used previously to monitor protonation reactions in other enzymes, including bacteriorhodopsin (53) and halorhodopsin (54). The frequency of the antisymmetric azide band falls outside the normal range of peptide and biological cofactor infrared absorption (1800-1200 cm À1 ), facilitating detection of azide even in complex biological systems (53,55).…”

Section: Resultsmentioning

confidence: 99%

Azide as a Probe of Proton Transfer Reactions in Photosynthetic Oxygen Evolution

Cooper¹,

Barry²

2008

Biophysical Journal

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In oxygenic photosynthesis, photosystem II (PSII) is the multisubunit membrane protein responsible for the oxidation of water to O2 and the reduction of plastoquinone to plastoquinol. One electron charge separation in the PSII reaction center is coupled to sequential oxidation reactions at the oxygen-evolving complex (OEC), which is composed of four manganese ions and one calcium ion. The sequentially oxidized forms of the OEC are referred to as the S(n) states. S(1) is the dark-adapted state of the OEC. Flash-induced oxygen production oscillates with period four and occurs during the S(3) to S(0) transition. Chloride plays an important, but poorly understood role in photosynthetic water oxidation. Chloride removal is known to block manganese oxidation during the S(2) to S(3) transition. In this work, we have used azide as a probe of proton transfer reactions in PSII. PSII was sulfate-treated to deplete chloride and then treated with azide. Steady state oxygen evolution measurements demonstrate that azide inhibits oxygen evolution in a chloride-dependent manner and that azide is a mixed or noncompetitive inhibitor. This result is consistent with two azide binding sites, one at which azide competes with chloride and one at which azide and chloride do not compete. At pH 7.5, the K(i) for the competing site was estimated as 1 mM, and the K(i)' for the uncompetitive site was estimated as 8 mM. Vibrational spectroscopy was then used to monitor perturbations in the frequency and amplitude of the azide antisymmetric stretching band. These changes were induced by laser-induced charge separation in the PSII reaction center. The results suggest that azide is involved in proton transfer reactions, which occur before manganese oxidation, on the donor side of chloride-depleted PSII.

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“…It is also noted that compound (I) and [ n Bu 4 N]-[Ir(pc)(N 3 )(aC)] both show a as (N 3 ) stretching band in a lower energy region, at 2022 and 2017 cm À1 , respectively, compared with the typical values of these bands in azido complexes (2120-2030 cm À1 ; Agrell, 1971). …”

Section: Commentmentioning

confidence: 94%

Azido(2,2′-bipyridine)(η⁵-pentamethylcyclopentadienyl)iridium(III) hexafluorophosphate

Suzuki

2005

Acta Cryst E

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Key indicatorsSingle-crystal X-ray study T = 296 K Mean (C-C) = 0.012 Å R factor = 0.049 wR factor = 0.138 Data-to-parameter ratio = 22.6For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e. # 2005 International Union of Crystallography Printed in Great Britain -all rights reservedIn the title compound, [Ir(C 10 H 15 )(N 3 )(C 10 H 8 N 2 )]PF 6 , the linear azide ligand adopts an end-on terminal coordination mode with a relatively long Ir-N bond of 2.230 (6) Å . The azide is asymmetric in an unusual way: the azide N-N bond adjacent to the azide Ir-N bond [1.025 (12) Å ] is significantly shorter than the terminal azide N-N bond [1.282 (15) Å ], while the azide Ir-N-N bond angle is 116.4 (6) .

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The Infra-red Spectra of Some Inorganic Azide Compounds.

Cited by 57 publications

References 0 publications

The infrared spectra of CdO-P2O5 and CdO-ZnO-P2O5 glasses

The infrared spectra of CdO-P2O5 and CdO-ZnO-P2O5 glasses

Azide as a Probe of Proton Transfer Reactions in Photosynthetic Oxygen Evolution

Azido(2,2′-bipyridine)(η⁵-pentamethylcyclopentadienyl)iridium(III) hexafluorophosphate

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The Infra-red Spectra of Some Inorganic Azide Compounds.

Cited by 57 publications

References 0 publications

The infrared spectra of CdO-P2O5 and CdO-ZnO-P2O5 glasses

The infrared spectra of CdO-P2O5 and CdO-ZnO-P2O5 glasses

Azide as a Probe of Proton Transfer Reactions in Photosynthetic Oxygen Evolution

Azido(2,2′-bipyridine)(η5-pentamethylcyclopentadienyl)iridium(III) hexafluorophosphate

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Azido(2,2′-bipyridine)(η⁵-pentamethylcyclopentadienyl)iridium(III) hexafluorophosphate