Crystal structure of silver salts of fatty acids

Vand, V.; Aitken, A.; Campbell, Raymond

doi:10.1107/s0365110x49001041

Cited by 60 publications

(38 citation statements)

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“…An image of a silver stearate42 scattering ring collected under the same beam conditions was used to find the beam center and determine the radial calibration. Each scattering profile was normalized for changes in beam intensity and checked for reproducibility.…”

Section: Methodsmentioning

confidence: 99%

Illuminating Solution Responses of a LOV Domain Protein with Photocoupled Small-Angle X-Ray Scattering

Lamb

Zoltowski

Pabit

et al. 2009

Journal of Molecular Biology

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The PAS-LOV domain is a signal transducing component found in a large variety of proteins that is responsible for sensing different stimuli such as light, oxygen and voltage. The LOV protein VVD regulates blue-light responses in the filamentous fungi Neurospora crassa. Using photocoupled, time-resolved small angle x-ray scattering, we extract the solution protein structure in both dark-adapted and light-activated states. Two distinct dark-adapted conformations are detected in the wild type protein: a compact structure that corresponds to the crystal structure of the dark-state monomer as well as an extended structure that is well modeled by introducing conformational disorder at the N-terminus of the protein. These conformations are accentuated in carefully selected variants, in which a key residue for propagating structural transitions, Cys71, has been mutated or oxidized. Despite different dark state conformations, all proteins form a common dimer in response to illumination. Taken together, these data support a reaction scheme that describes the mechanism for light-induced dimerization of VVD. Envelope reconstructions of the transient light-state dimer reveal structures that are best described by a parallel arrangement of subunits that have significantly changed conformation compared to the crystal structure.

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Section: Methodsmentioning

confidence: 99%

Illuminating Solution Responses of a LOV Domain Protein with Photocoupled Small-Angle X-Ray Scattering

Lamb

Zoltowski

Pabit

et al. 2009

Journal of Molecular Biology

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“…Carboxylates In order to understand the nature of any interface between the silver halide and silver carboxylate it is first necessary to understand the fundamental structure of the silver carboxylate. It is known that silver stearate has a triclinic unit cell and forms a layered structure with two silvers and two carboxylates in the layer (Vand et al, 1949). From this unit cell the distance between the silver atoms in the layers is 50.35 Å .…”

Section: Results and Discussion Unique Structural Features Of Silvermentioning

confidence: 99%

Electron microscope characterization of AgBr heterojunctions with silver carboxylates and their influence on the morphology of developed silver particles in thermally developed photomaterials

Bokhonov¹,

Burleva²,

Whitcomb³

et al. 1998

Microsc. Res. Tech.

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Silver halide crystals formed during in situ treatment of silver stearate crystals with various halidizing agents are observed by scanning and transmission electron microscopy to form on the lateral edges of the silver carboxylate crystals. The location of the silver halide phase on the crystal edge is dictated by the anisotropic structure of the silver stearate crystal lattice, specifically, the layered structure in which silver ion layers are separated by long‐chain hydrocarbon groups. The formation of AgBr on the lateral faces of these crystals is proposed to be typical not only of the formation of silver halide on silver stearate but also for all silver carboxylates of the general formula [AgCnH2n‐1O2]2 when the crystals of these silver carboxylates have anisotropic, layered structures. The silver bromide/silver carboxylate heterojunction in an in situ system has been clearly observed by transmission electron microscopy. The heterojunction is comprised of a distorted silver carboxylate lattice, which accommodates the misalignment between the AgBr and [Ag(O2CR)]2 crystal lattices. The nature of heterojunction between the AgBr and the silver carboxylate when the AgBr is prepared separately from the preparation of the silver carboxylate differs from the in situ heterojunction. In this case, a layered compound, proposed to have a Ag1‐xNaxSt composition, forms between the AgBr and the silver stearate which is a unique feature of this interface. The differences in the structure of interfaces formed between the silver halide and the silver fatty acid complex result in different silver particle morphologies during thermal development of exposed photothermographic films. The developed silver is generally filamentary when the photothermographic material contains silver halide prepared by the in situ exchange reaction between silver carboxylate and a brominating agent. If the photothermographic material is prepared from previously synthesized silver halide crystals, the preformed AgBr route, the developed silver generally crystallizes as dendritic crystals. Microsc. Res. Tech. 42:152–172, 1998. © 1998 Wiley‐Liss, Inc.

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“…The XRD pattern shows a well-developed progression of intense reflections. These reflections can be interpreted in terms of three-dimensionally stacked silver carboxylate layers with an interlayer lattice dimension [5][6][7][8][9][10]. This implies that, as in silver alkanecarboxylates, each layer of Ag-4NPB is separated from the neighboring layer by twice the length of the nitrophenylbutyric moiety.…”

Section: Methodsmentioning

confidence: 97%

Thermal and photochemical characteristics of silver 4-(4-nitrophenyl)butyrate revealed by infrared and Raman spectroscopy

Kim

Lee

Kim

2007

Vibrational Spectroscopy

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Crystal structure of silver salts of fatty acids

Cited by 60 publications

References 0 publications

Illuminating Solution Responses of a LOV Domain Protein with Photocoupled Small-Angle X-Ray Scattering

Illuminating Solution Responses of a LOV Domain Protein with Photocoupled Small-Angle X-Ray Scattering

Electron microscope characterization of AgBr heterojunctions with silver carboxylates and their influence on the morphology of developed silver particles in thermally developed photomaterials

Thermal and photochemical characteristics of silver 4-(4-nitrophenyl)butyrate revealed by infrared and Raman spectroscopy

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