Mesolamellar VPO phases obtained by incorporating long chain alkyl amine surfactants into the layeredvanadium phosphate dihydrate phase
IR@IIP: CSIR-Indian Institute of Petroleum, Dehradun
View Archive Info| Field | Value | |
| Creator |
Datta,Arunabha
Dasgupta,Soumen Agarwal,Monika Ray,S.S |
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| Date |
2009-06-23T06:31:31Z
2009-06-23T06:31:31Z 2009-06-23T06:31:31Z |
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| Identifier |
http://hdl.handle.net/123456789/246
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| Description |
A series of mesolamellar VPO-amine phases have been obtained by intercalation of alkyl amines of differing alkyl chain lengths
into the catalytically important VOPO4 Æ2H2O phase. It is demonstrated that there is considerable variation in the conformation of
the incorporated alkyl amines, which progressively assume a more disordered gauche conformation in their internal methylene
groups with decreasing chain length. This finding contradicts the assumption made by previous workers that the alkyl amines incorporated
into VPO-amine nanocomposites have fully stretched all trans conformations. From the present study, the observation that
the basal spacing in long chain amine intercalated mesostructured VPO phases is smaller than that expected from the fully stretched
amine molecule can be attributed to the shortening of the incorporated amine molecule due to the gauche conformation of the internal
methylene groups. This is in contrast to the postulation of tilted configurations of fully stretched all trans amine molecules, made
by earlier workers. It is also observed that the alkyl amine to vanadium ratio increases with increasing alkyl tail length of the incorporated
amine, which is consistent with our observation of more ordering in the longer chain amines leading to better packing.
Keywords: Vanadium (V) orthophosphate; Alkyl amine surfactant; Intercalation; Mesostructured VPO phases; Conformational heterogeneity
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| Language |
en_US
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| Subject |
NMR
Vanadium Orthophosphate Alkyl Amine surfactant |
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| Title |
Mesolamellar VPO phases obtained by incorporating long chain alkyl amine surfactants into the layeredvanadium phosphate dihydrate phase
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| Type |
Article
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