Dataset Information

Crystal structure of dilead(II) oxochromate(VI) oxotellurate(IV).

ABSTRACT: Reaction of chromium(III) precursors with TeO₂ in PbF₂/PbO melts in air led to oxidation of chromium(III) to chromium(VI), whereas tellurium remained its oxidation state of IV. In the resulting title compound, Pb₂(CrO₄)(TeO₃), the two types of anions are isolated from each other, hence a double salt is formed. The two independent Pb²⁺ cations exhibit coordination number nine under formation of very distorted coordination polyhedra [bond-length range = 2.363?(6)-3.276?(7)?Å]. The oxochromate(VI) and oxotellurate(IV) anions have tetra-hedral and trigonal-pyramidal configurations, respectively. In the crystal structure, (001) layers of metal cations alternate with layers of TeO₃^2- and CrO₄^2- anions along [001], forming a three-dimensional framework structure. Pb₂(CrO₄)(TeO₃) is isotypic with its sulfate analogue Pb₂(SO₄)(TeO₃) and is comparatively discussed.

SUBMITTER: Weil M

PROVIDER: S-EPMC5458308 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Crystal structure of dilead(II) oxochromate(VI) oxotellurate(IV).

Weil Matthias M

Acta crystallographica. Section E, Crystallographic communications 20170516 Pt 6

Reaction of chromium(III) precursors with TeO2 in PbF2/PbO melts in air led to oxidation of chromium(III) to chromium(VI), whereas tellurium remained its oxidation state of IV. In the resulting title compound, Pb2(CrO4)(TeO3), the two types of anions are isolated from each other, hence a double salt is formed. The two independent Pb2+ cations exhibit coordination number nine under formation of very distorted coordination polyhedra ...[more]

PMID: 28638643

Similar Datasets

Project description:BackgroundThe vitreoretinal interface is the border of the cortical vitreous and the inner surface of the retina. The adhesion of the cortical vitreous to the ILM, namely vitreoretinal adhesion, involves a series of complex molecular adhesion mechanisms and has been considered as an important pathogenic factor in many vitreoretinal diseases. The presence of type VI collagen at the vitreoretinal interface and its possible interaction with collagens and glycoproteins indicates that type VI collagen may contribute to the vitreoretinal adhesion.PurposeTo clarify the ultrastructural location of type VI collagen and its relationship to type II and IV collagens at the vitreoretinal interface.MethodsThe ultrastructural localization of type II, IV and VI collagens in the adult human vitreoretinal interface of five donor eyes was evaluated by transmission electron microscopy using immunogold labeling.ResultsIn the pre-equatorial region, we observed densely packed vitreous lamellae with a partly intraretinal course containing type II and VI collagens, reticular structures containing type IV and VI collagens and a thin inner limiting membrane (ILM) containing type IV and VI collagens in a linear distribution pattern. From the anterior to the posterior retina, the linear pattern of type IV and VI collagen labeling gradually became more diffusely present throughout the entire thickness of the ILM.ConclusionsThe presence of type VI collagen in vitreous lamellae penetrating the ILM into the superficial retina suggests that type VI collagen may be involved in the organization of vitreous fibers into lamellae and in the adhesion of the vitreous fibers to the retina. The close relation of type VI to type IV collagen in the ILM suggests that type VI collagen is an important collagen type in the ILM. The topographic variations of type IV and VI collagens in the different regions of the ILM suggest a regional heterogeneity of the ILM. The reticular labeling pattern of type IV and VI collagens observed in the anterior vitreous are highly similar to labeling patterns of blood vessel walls. In the anterior vitreous, they may represent remnants of the regressed embryonic hyaloid blood vessel system. Their presence is in support of the theory on interactive remodeling of the developing vitreous as opposed to the main stream theory of displacement and compression of the primary by the secondary vitreous.

Dataset Information

Crystal structure of dilead(II) oxochromate(VI) oxotellurate(IV).

Publications

Crystal structure of dilead(II) oxochromate(VI) oxotellurate(IV).

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets