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Titolo:
Transformations of the low-dimensional zinc phosphates to complex open-framework structures. Part 2: one-dimensional ladder to two- and three-dimensional structures
Autore:
Choudhury, A; 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 Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India Indian Inst Sci Bangalore Karnataka India 560012 560012, Karnataka, India
Titolo Testata:
JOURNAL OF MATERIALS CHEMISTRY
fascicolo: 5, volume: 11, anno: 2001,
pagine: 1537 - 1546
SICI:
0959-9428(2001)11:5<1537:TOTLZP>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIRECTING ORGANIC AMINES; METAL PHOSPHATES; LAYERS; CHANNELS; CHAINS; NETS;
Keywords:
Zinc phosphate; Open-framework structure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
35
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:
A. Choudhury et al., "Transformations of the low-dimensional zinc phosphates to complex open-framework structures. Part 2: one-dimensional ladder to two- and three-dimensional structures", J MAT CHEM, 11(5), 2001, pp. 1537-1546

Abstract

Open-framework zinc phosphates with one-dimensional ladder structures are shown to transform, under simple reaction conditions, to two- and three-dimensional structures. Thus, the one-dimensional ladder, [C6N4H22](0.5)[Zn(HPO4)(2)], I, on heating with piperazine in aqueous solution gives a layer phosphate, [C4N2H12][Zn-2(PO4)(2)], III, and the three-dimensional phosphates[C2N2H10](0.5)[Zn(PO4)], IV, [C6N4H22](0.5)[Zn-2(PO4)(2)], V and [C6N4H21](4)[Zn-21(PO4)(18)], VI. On heating in water in the absence of any amine, Itransforms to a three-dimensional solid, [C6N4H22](0.5)[Zn-3(PO4)(2)(HPO4)], VII, with 16-membered channels. Of these, III and IV are the only new compounds. The phosphates formed by the transformations of I exhibit unique structural features. Thus, in III, the layers are formed only with 3- and 4-membered rings and have step-like features due to the presence of infinite Zn-O-Zn linkages. Compound IV has a structure similar to that of the naturally occurring aluminosilicate, gismondine, and VI possesses unusual Zn7O6 clusters. The ladder zinc phosphate, [C3N2H12][Zn(HPO4)(2)], II, transforms to two layered compounds, [C3N2H12][Zn-4(PO4)(2)(HPO4)(2)], VIII, and [C3N2H12][Zn-2(HPO4)(3)], IX, on heating with zinc acetate and water, respectively. II, on heating in water in the presence of other amines, forms a ladder, [C3N2H5][Zn(HPO4)], X, and a three-dimensional phosphate, [C3N2H12](2)[Zn-5(H2O)(PO4)(4)(HPO4)], XI. The syntheses and structures of VIII-XI have already been reported. What is interesting is that the majority of the transformations seem to occur through the process of deprotonation of the phosphoryl group and elimination of the -HPO4 unit. The transformations of the ladder phosphates to higher dimensional structures reported in the present study not only demonstrate the seminal role of the one-dimensional structures as basic building units, but also the likely occurrence of self-assembly ofthese one-dimensional units in the building-up process.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 16:04:40