Crystal structures of the new diphosphates, K2NiP2O7 and K6Sr2Ni5(P2O7)5
Identifieur interne : 000F61 ( Main/Exploration ); précédent : 000F60; suivant : 000F62Crystal structures of the new diphosphates, K2NiP2O7 and K6Sr2Ni5(P2O7)5
Auteurs : A. Elmaadi [Maroc] ; A. Boukhari [Maroc] ; E. M. HoltSource :
- Journal of chemical crystallography [ 1074-1542 ] ; 1995.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Crystalline K2NiP2O7 (I) : monoclinic, P21, a = 9.230(2), b = 17.540(8), c = 8.319(9)Å, β = 91.44(2)°, Z = 8, dcalc = 3.067 g cm-3, λMoKα = 0.71069Å, R/Rw = 6.5/9.4%, is characterized by the existence of face sharing NiO6 octahedra with Ni-Ni separation of 2.827Å (Ni-O ; 1.93(2) - 2.17(2)Å). K+ is seen in sites of seven, six, and fivefold coordination (K-O, averages ; 2.83(2), 2.81(2), and 2.77(2)Å, respectively). P2O74- groups are observed in semieclipsed conformation. K6Sr2Ni5(P2O7)5 (II) crystallizes in monoclinic space group P21/c ; a = 11.038(7), b = 9.533(13), c = 7.438(2)Å, β = 100.13(4)°, Dcalc = 3.309 g cm-3, Z = 2, R/Rw = 6.4/8.1%. Nickel atoms are distributed on planes parallel to the crystallographic (100) plane at x = 0 and x = 0.5. On the planes, x = 0, Ni2+ ions form successive linked trimers of edge sharing NiO6 octahedra (Ni-Ni, 3.018(1), 3.008(1)Å ; Ni-O, av 2.07(2)Å). The intermediate planes (x = 0.5) contain isolated and six coordinate Ni2+ ions (Ni-O av. 2.09(2)Å). Seven-coordinate potassium ions (K-O, av. 2.74(2)Å) are located on intermediate planes at x = 0.25 and 0.75. P2O74- groups are found in eclipsed conformation. Strontium atoms are located between nickel and potassium planes and are surrounded by seven oxygen atoms (Sr-O, av. 2.586(2)Å).
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Crystal structures of the new diphosphates, K<sub>2</sub>NiP<sub>2</sub>O<sub>7</sub> and K<sub>6</sub>Sr<sub>2</sub>Ni<sub>5</sub>(P<sub>2</sub>O<sub>7</sub>)<sub>5</sub></title><author><name sortKey="Elmaadi, A" sort="Elmaadi, A" uniqKey="Elmaadi A" first="A." last="Elmaadi">A. Elmaadi</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Univ. Mohammed V, fac. sci., lab. chimie solide appliquée</s1><s2>Rabat</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Maroc</country><placeName><settlement type="city">Rabat</settlement><region nuts="2">Rabat-Salé-Kénitra</region></placeName></affiliation></author><author><name sortKey="Boukhari, A" sort="Boukhari, A" uniqKey="Boukhari A" first="A." last="Boukhari">A. Boukhari</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Univ. Mohammed V, fac. sci., lab. chimie solide appliquée</s1><s2>Rabat</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Maroc</country><placeName><settlement type="city">Rabat</settlement><region nuts="2">Rabat-Salé-Kénitra</region></placeName></affiliation></author><author><name sortKey="Holt, E M" sort="Holt, E M" uniqKey="Holt E" first="E. M." last="Holt">E. M. Holt</name></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">96-0053683</idno><date when="1995">1995</date><idno type="stanalyst">PASCAL 96-0053683 INIST</idno><idno type="RBID">Pascal:96-0053683</idno><idno type="wicri:Area/PascalFrancis/Corpus">000544</idno><idno type="wicri:Area/PascalFrancis/Curation">000523</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000549</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000549</idno><idno type="wicri:doubleKey">1074-1542:1995:Elmaadi A:crystal:structures:of</idno><idno type="wicri:Area/Main/Merge">001020</idno><idno type="wicri:Area/Main/Curation">000F61</idno><idno type="wicri:Area/Main/Exploration">000F61</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Crystal structures of the new diphosphates, K<sub>2</sub>NiP<sub>2</sub>O<sub>7</sub> and K<sub>6</sub>Sr<sub>2</sub>Ni<sub>5</sub>(P<sub>2</sub>O<sub>7</sub>)<sub>5</sub></title><author><name sortKey="Elmaadi, A" sort="Elmaadi, A" uniqKey="Elmaadi A" first="A." last="Elmaadi">A. Elmaadi</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Univ. Mohammed V, fac. sci., lab. chimie solide appliquée</s1><s2>Rabat</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Maroc</country><placeName><settlement type="city">Rabat</settlement><region nuts="2">Rabat-Salé-Kénitra</region></placeName></affiliation></author><author><name sortKey="Boukhari, A" sort="Boukhari, A" uniqKey="Boukhari A" first="A." last="Boukhari">A. Boukhari</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Univ. Mohammed V, fac. sci., lab. chimie solide appliquée</s1><s2>Rabat</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Maroc</country><placeName><settlement type="city">Rabat</settlement><region nuts="2">Rabat-Salé-Kénitra</region></placeName></affiliation></author><author><name sortKey="Holt, E M" sort="Holt, E M" uniqKey="Holt E" first="E. M." last="Holt">E. M. Holt</name></author></analytic><series><title level="j" type="main">Journal of chemical crystallography</title><title level="j" type="abbreviated">J. chem. crystallogr.</title><idno type="ISSN">1074-1542</idno><imprint><date when="1995">1995</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of chemical crystallography</title><title level="j" type="abbreviated">J. chem. crystallogr.</title><idno type="ISSN">1074-1542</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Crystal structure</term><term>Experimental study</term><term>Multi-element compounds</term><term>Nickel Pyrophosphates</term><term>Nickel phosphates</term><term>Potassium Pyrophosphates</term><term>Potassium phosphates</term><term>Quaternary compounds</term><term>Strontium Pyrophosphates</term><term>Strontium phosphates</term><term>XRD</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Etude expérimentale</term><term>Composé quaternaire</term><term>Potassium phosphate</term><term>Nickel phosphate</term><term>Potassium Diphosphate</term><term>Nickel Diphosphate</term><term>Strontium phosphate</term><term>Strontium Diphosphate</term><term>Composé n éléments</term><term>XRD</term><term>Structure cristalline</term><term>6166F</term><term>K2NiP2O7</term><term>K Ni O P</term><term>K6Sr2Ni5(P2O7)5</term><term>K Ni O P Sr</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Crystalline K<sub>2</sub>NiP<sub>2</sub>O<sub>7</sub> (I) : monoclinic, P2<sub>1</sub>, a = 9.230(2), b = 17.540(8), c = 8.319(9)Å, β = 91.44(2)°, Z = 8, d<sub>calc</sub> = 3.067 g cm<sup>-3</sup>, λMoK<sub>α</sub> = 0.71069Å, R/R<sub>w</sub> = 6.5/9.4%, is characterized by the existence of face sharing NiO<sub>6</sub> octahedra with Ni-Ni separation of 2.827Å (Ni-O ; 1.93(2) - 2.17(2)Å). K<sup>+</sup> is seen in sites of seven, six, and fivefold coordination (K-O, averages ; 2.83(2), 2.81(2), and 2.77(2)Å, respectively). P<sub>2</sub>O<sub>7</sub><sup>4-</sup> groups are observed in semieclipsed conformation. K<sub>6</sub>Sr<sub>2</sub>Ni<sub>5</sub>(P<sub>2</sub>O<sub>7</sub>)<sub>5</sub> (II) crystallizes in monoclinic space group P2<sub>1</sub>/c ; a = 11.038(7), b = 9.533(13), c = 7.438(2)Å, β = 100.13(4)°, D<sub>calc</sub> = 3.309 g cm<sup>-3</sup>, Z = 2, R/R<sub>w</sub> = 6.4/8.1%. Nickel atoms are distributed on planes parallel to the crystallographic (100) plane at x = 0 and x = 0.5. On the planes, x = 0, Ni<sup>2+</sup> ions form successive linked trimers of edge sharing NiO<sub>6</sub> octahedra (Ni-Ni, 3.018(1), 3.008(1)Å ; Ni-O, av 2.07(2)Å). The intermediate planes (x = 0.5) contain isolated and six coordinate Ni<sup>2+</sup> ions (Ni-O av. 2.09(2)Å). Seven-coordinate potassium ions (K-O, av. 2.74(2)Å) are located on intermediate planes at x = 0.25 and 0.75. P<sub>2</sub>O<sub>7</sub><sup>4-</sup> groups are found in eclipsed conformation. Strontium atoms are located between nickel and potassium planes and are surrounded by seven oxygen atoms (Sr-O, av. 2.586(2)Å).</div></front></TEI><affiliations><list><country><li>Maroc</li></country><region><li>Rabat-Salé-Kénitra</li></region><settlement><li>Rabat</li></settlement></list><tree><noCountry><name sortKey="Holt, E M" sort="Holt, E M" uniqKey="Holt E" first="E. M." last="Holt">E. M. Holt</name></noCountry><country name="Maroc"><region name="Rabat-Salé-Kénitra"><name sortKey="Elmaadi, A" sort="Elmaadi, A" uniqKey="Elmaadi A" first="A." last="Elmaadi">A. Elmaadi</name></region><name sortKey="Boukhari, A" sort="Boukhari, A" uniqKey="Boukhari A" first="A." last="Boukhari">A. Boukhari</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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