Organometallic derivatives of cyclotriphosphazene as precursors of nanostructured metallic materials: a new solid state method
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Date
2009-06-09
Authors
Díaz, Carlos
Valenzuela, María Luisa
Zuinga, Luis
O'Dwyer, Colm
Journal Title
Journal ISSN
Volume Title
Publisher
Springer
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Abstract
The cyclic phosphazene trimers [N3P3(OC6H5)5OC5H4N·Ti(Cp)2Cl][PF6] (3), [N3P3(OC6H4CH2CN·Ti(Cp)2Cl)6][PF6]6 (4), [N3P3(OC6H4-But)5(OC6H4CH2CN·Ti(Cp)2Cl)][PF6] (5), [N3P3(OC6H5)5C6H4CH2CN·Ru(Cp)(PPh3)2][PF6] (6), [N3P3(OC6H5)5C6H4CH2CN·Fe(Cp)(dppe)][PF6] (7) and N3P3(OC6H5)5OC5H4N·W(CO)5 (8) were prepared and characterized. As a model, the simple compounds [HOC5H5N·Ti(Cp)2Cl]PF6 (1) and [HOC6H4CH2CN·Ti(Cp)2Cl]PF6 (2) were also prepared and characterized. Pyrolysis of the organometallic cyclic trimers in air yields metallic nanostructured materials, which according to transmission and scanning electron microscopy (TEM/SEM), energy-dispersive X-ray microanalysis (EDX), and IR data, can be formulated as either a metal oxide, metal pyrophosphate or a mixture in some cases, depending on the nature and quantity of the metal, characteristics of the organic spacer and the auxiliary substituent attached to the phosphorus cycle. Atomic force microscopy (AFM) data indicate the formation of small island and striate nanostructures. A plausible formation mechanism which involves the formation of a cyclomatrix is proposed, and the pyrolysis of the organometallic cyclic phosphazene polymer as a new and general method for obtaining metallic nanostructured materials is discussed.
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Keywords
Organometallic , Cyclotriphosphazenes , Nanomaterials , Solid-state
Citation
Diaz, C., Valenzuela, M. L., Zuniga, L. and O'Dwyer, C. (2009) 'Organometallic derivatives of cyclotriphosphazene as precursors of nanostructured metallic materials: a new solid state method', Journal of Inorganic and Organometallic Polymers and Materials, 19(4), pp. 507-520. http://dx.doi.org/10.1007/s10904-009-9286-4
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© Springer Science+Business Media, LLC 2009. The final publication is available at Springer via http://dx.doi.org/10.1007/s10904-009-9286-4