Copper(II) phosphate

Shoemaker, G. L.; Anderson, James B.; Kostiner, E.

doi:10.1107/s0567740877010012

Cited by 56 publications

(32 citation statements)

References 4 publications

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“…The M-O bond lengths range from 2.120(3) to 2.423(3) Å . The corresponding mean value of 2.273 Å is similar to that 2.284 Å observed in Cu 3 (PO 4 ) 2 for the Cu 2+ ion with C. N ¼ 6 [13]. The corresponding BLD parameter (4.4%) is characteristic of a highly distorted octahedron.…”

Section: Article In Presssupporting

confidence: 57%

Crystal structure, magnetic susceptibility and Mössbauer spectroscopy of the mixed-valence iron phosphate Na1/2Cu4/3Fe2(PO4)3

Hidouri¹,

Lajmi²,

Wattiaux

et al. 2006

Journal of Solid State Chemistry

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Section: Article In Presssupporting

confidence: 57%

Crystal structure, magnetic susceptibility and Mössbauer spectroscopy of the mixed-valence iron phosphate Na1/2Cu4/3Fe2(PO4)3

Hidouri¹,

Lajmi²,

Wattiaux

et al. 2006

Journal of Solid State Chemistry

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“…The Cu sites in the samples are not believed to exactly match those in any of the reference compounds, but the success of the reconstructions reflects that Cu in all of them occupies complex oxygen coordinated environments. In anhydrous Cu 3 (PO 4 ) 2 , the two Cu sites are distorted trigonal bipyramidal and distorted square planar sites (61). In Cu(OAc) 2 ⅐ H 2 O, the Cu site is a distorted square pyramid (70).…”

Section: Resultsmentioning

confidence: 99%

“…This type of environment is postulated as the pH-insensitive site, since Cu phosphates are not dissociated at pH 2 to pH 5 (71). As the starting point for this model, we simulated the EXAFS of a Cu atom with one PO 4 3Ϫ ligand in the configuration presented by the square planar site in anhydrous Cu 3 (PO 4 ) 2 (61). A phosphate group, defined by one path to the phosphorus core and four paths to the four oxygens, was refined against the sample EXAFS.…”

Section: Resultsmentioning

confidence: 99%

Determination of Cu Environments in the CyanobacteriumAnabaena flos-aquaeby X-Ray Absorption Spectroscopy

Kretschmer

Meitzner

Gardea‐Torresdey³

et al. 2004

Appl Environ Microbiol

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Whole cells and peptidoglycan isolated from cell walls of the cyanobacterium Anabaena flos-aquae were lyophilized and used at pH 2 and pH 5 in Cu(II) binding studies. X-ray absorption spectra measured at the Cu K-edge were used to determine the oxidation states and chemical environments of Cu species in the whole-cell and peptidoglycan samples. In the whole-cell samples, most of the Cu retained at both pH values was coordinated by phosphate ligands. The whole-cell fractions contained significant concentrations of Cu(I) as well as Cu(II). An X-ray absorption near-edge spectrum analysis suggested that Cu(I) was coordinated by amine and thiol ligands. An analysis of the peptidoglycan fractions found that more Cu was adsorbed by the peptidoglycan fraction prepared at pH 5, due to increased chelation by amine and carboxyl ligands. The peptidoglycan fractions, also referred to as the cell wall fractions, contained little or no Cu(I). The Cu loading level was 30 times higher in the cell wall sample prepared at pH 5 than in the sample prepared at pH 2. Amine and bidentate carboxyl ligands had similar relative levels of importance in cell wall peptidoglycan samples prepared at both pH values, but phosphate coordination was insignificant.Heavy metals damage the environment since they are nonbiodegradable and have toxic effects on plants, animals, and humans. Precipitation, coagulation, membrane-based processes, and ion exchange are some of the current approaches to the remediation of contaminated sites, but these methods are expensive and lose effectiveness as metal concentrations fall (54). The use of microbes for the bioremediation of trace metals has shown potential for enabling a site to meet regulatory specifications. Experiments have demonstrated the ability of bacteria to immobilize and concentrate metal ions (6,14,28,37,46).Mechanisms by which cells accumulate, sequester, and detoxify metals have been investigated. One indirect approach has been the determination of uptake and retention as a function of pH or competition with some other cation (14,16,20,35). Another has been to chemically modify plant or cell matter (for example, by esterification) to render specific classes of prospective ligands unavailable and to evaluate the impact on metal binding capacity (7,21). In a study of binding sites in cell walls of gram-positive bacteria, teichoic acid, presenting phosphate sites, was extracted with aqueous alkali in order to quantify its contribution to metal binding (7).The chemical studies described are informative but involve many assumptions due to the complexity of biological systems. Also, because of that complexity, few analytical probes can illuminate the chemistry of metals associated with cells. X-ray absorption spectroscopy (XAS) is element specific, returning information for a single atomic number in an arbitrarily complicated mixture (52). XAS is nondestructive, and no sample reduction or digestion is required which would alter the chemistry of the element of interest. XAS can be used to determine the ...

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“…Single-crystal X-ray analyses of orthophosphates M3(PO4)2, where M is an alkaline-earth or bivalent transition metal, have been reported for ol-Ca3(PO4)2 (Mathew, Schroeder, Dickens & Brown, 1977),/3-Ca3-(PO4)2 (Dickens, Schroeder & Brown, 1974), Ca3(PO4)2 (high pressure; Roux, Loiier& Bonel, 1978), ot-Sr3(PO4)2 and Ba3(PO4)2 (Zachariasen, 1948), Co3(PO4)2 (Anderson, Kostiner, Miller & Rea, 1975), Ni3(PO4)2 (Calvo & Fagiani, 1975), Cu3(PO4)2 (Shoemaker, Anderson & Kostiner, 1977), ol-Zn3(PO4) 2 (Calvo, 1965), /3-Zn3(PO4)2 (Stephens & Calvo, 1967), Fe3(PO4)2 (Kostiner & Rea, 1974), Mg3(PO4)2 (Nord & Kierkegaard, 1968) and /3t-Mn3(PO4)2 (Stephens & Calvo, 1969).…”

Section: Commentmentioning

confidence: 99%