skip to main content

Title: Synthesis and characterization of a new family of alkylammonium–chromium phosphates with worm-like morphology

A series of layered alkylammonium–chromium phosphates, formulated as [C{sub n}H{sub 2n+1}NH{sub 3}]Cr(OH)PO{sub 4} (n=2–6), has been synthesized under hydrothermal conditions. The interlayer spacing, increasing linearly with the increase of alkyl-chain length from 13.61 Å (n=2) to 21.20 Å (n=6), is occupied by a double sheet of packed amine molecules with a tilt angle of ca. 51° respect to the inorganic sheet. The powders are constituted by circular plates (diameter=0.5–3 µm, thickness=∼50 nm) with central holes when n=4–6, stacked in axial direction showing worm-like morphologies. The presence of holes, and some corrugated and zig-zag fashions observed on the edge of thin circular plates are the most probable ways for the reduction of the steric tensions between organic and inorganic portions in these hybrid materials. The thermal and thermo-oxidative stability of selected compounds have been studied, including the determination of activation energy data for the decomposition processes. - Graphical abstract: A novel series of layered alkylammonium–chromium phosphates, [C{sub n}H{sub 2n+1}NH{sub 3}]Cr(OH)PO{sub 4} (n=2–6), was obtained and characterized. The interlayer spacing, increasing linearly with the increase of alkyl-chain length, is occupied by a double sheet of packed amine molecules. The powders are constituted by circular plates (diameter=0.5–3 µm, thickness=∼50 nm) with central holesmore » when n=4–6, stacked in axial direction showing worm-like morphologies. - Highlights: • A series of alkylammonium–chromium phosphates has been obtained by the hydrothermal method. • The interlayer spacing increases linearly with the increase of alkyl-chain length. • The interlayer spacing is occupied by a double sheet of packed amine molecules. • The powders are constituted by stacked circular plates showing wormlike morphology. • Thermal behaviour depends on the atmosphere used and the intercalated amine.« less
Authors:
 [1] ;  [2] ;  [1] ;  [2] ;  [3]
  1. Servicios Científico-Técnicos, Universidad de Oviedo-CINN, 33006 Oviedo (Spain)
  2. (Spain)
  3. Departamento de Química Orgánica e Inorgánica, Universidad de Oviedo-CINN, 33006 Oviedo (Spain)
Publication Date:
OSTI Identifier:
22443491
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 221; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ACTIVATION ENERGY; AMINES; AMMONIUM COMPOUNDS; CHROMIUM; CHROMIUM PHOSPHATES; CLATHRATES; HYBRIDIZATION; HYDROTHERMAL SYNTHESIS; MOLECULES; OXIDATION; POWDERS; PYROLYSIS; STABILITY; THICKNESS