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Titolo:
Open-framework zinc phosphates synthesized in the presence of structure-directing organic amines
Autore:
Chidambaram, D; Neeraj, S; Natarajan, S; Rao, CNR;
Indirizzi:
Jawaharlal Nehru Ctr Adv Sci Res, Chem & Phys Mat Unit, Bangalore 560064, Karnataka, India Jawaharlal Nehru Ctr Adv Sci Res Bangalore Karnataka India 560064 , India
Titolo Testata:
JOURNAL OF SOLID STATE CHEMISTRY
fascicolo: 1, volume: 147, anno: 1999,
pagine: 154 - 169
SICI:
0022-4596(199910)147:1<154:OZPSIT>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
SINGLE-CRYSTAL STRUCTURES; ALUMINOPHOSPHATE; CATALYSIS; ZEOLITE; LAYERS; SOLIDS;
Keywords:
hydrothermal methods; open-framework materials; zinc phosphates;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Rao, CNR Jawaharlal Nehru Ctr Adv Sci Res, Chem & Phys Mat Unit, Bangalore560064, Karnataka, India Jawaharlal Nehru Ctr Adv Sci Res Bangalore Karnataka India 560064
Citazione:
D. Chidambaram et al., "Open-framework zinc phosphates synthesized in the presence of structure-directing organic amines", J SOL ST CH, 147(1), 1999, pp. 154-169

Abstract

Four open-framework zinc phosphates have been synthesized in the presence of structure-directing organic amines. Crystal data: compound I, [NH3(CH2)(2)NH3. Zn-2(HPO4)(2)(H2PO4)(2)], monoclinic, space group=P2(1)/c (No. 14), a=16.420(2) Angstrom, b = 7.826(1) Angstrom, c = 14.640(1) Angstrom, beta =116.47(1)degrees V= 1684.05(2) Angstrom(3), Z= 4, M = 578.8(1), D-calc = 2.22 g cm(-3), MoK alpha, R-F = 0.05; compound II, [NH3(CH2)(2)NH3. Zn(HPO4)(2)] monoclinic, space group=P2(1)/c (No. 14), a=5.161(1) Angstrom, b = 15.842(2) Angstrom, c = 12.027(2) Angstrom, beta = 92.36(2)degrees, V= 982.41(1) Angstrom(3), Z= 4, M= 319.45(1), D-calc = 2.16 gcm(-3), MoK alpha, R-F =0.06; compound III, [NH3CH2CH(OH)CH2NH3. Zn-2(HPO4)(3)], monoclinic, spacegroup=P2(1)/c (No. 14), a = 8.615(1) Angstrom, b = 9.648(1) Angstrom, c = 17.209(1) Angstrom, beta= 93.02(1)degrees, V= 1428.4(2), Z= 4, M = 510.8(1), D-calc = 1.79 g cm(-3), MoK alpha, R-F = 0.03; compound IV, [NH3(CH2)(6)NH3. Zn-3(HPO4)(4)H2O], monoclinic, space group=C2/c (No. 15), a=16.815(1) Angstrom, b = 8.970(1) Angstrom, c = 15.080(1) Angstrom, beta = 97.25(1)degrees, V= 2256.4(1), Z= 4, M= 734.3(1), D-calc = 2.16 g cm(-3), MoK alpha, R-F = 0.05. The compounds are made up of ZnO4 and PO4 tetrahedra that share vertices. The connectivity between the ZnO4 and PO4 units gives rise to layers in I, III, and IV and a chain architecture in II. The structure-directing organic amine holds the chains and the layers in position through multi-point hydrogen bonding. The layers in I and III consist of bifurcated 12-membered rings, and those in IV, of 8-membered rings. The phosphate units occur either as hydrogen phosphate (HPO4) or dihydrogen phosphate (H2PO4) moieties. These and other novel features in these materials suggest that furtherexploration may lead to many new solids with interesting structures. As a guide to understanding the formation of different ring structures in Zn phosphates and allied materials, a possible pathway involving the basic 4-membered ring is suggested, (C) 1999 Academic Press.

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Documento generato il 01/12/20 alle ore 20:01:57