We present a comprehensive study of the partially reduced polyoxomolybdate H3Mo57V6(NO)(6)O-183(H2O)(18)(21-) encapsulated in a shell of dimethyldioctadecylammonium (DODA) surfactant molecules. Treatment of an aqueous solution of (NH4)(21)H3Mo57V6-(NO)(6)O-183(H2O)(18). 65H(2)O (1a) with a trichloromethane solution of the surfactant leads to instant transfer of the encapsulated complex anion into the organic phase. Results from vibrational spectroscopy, analytical ultracentrifugation, small-angle X-ray scattering, transmission electron microscopy, elemental analysis, and Langmuir compression isotherms are consistent with a single polyoxometalate core encapsulated within a shell of 20 DODA molecules. The molar mass of the supramolecular assembly is 20 249 g mol(-1) and the diameter is 3.5nm. A material with the empirical formula (DODA)(20)(NH4)H-3-Mo57V6(NO)(6)O-183(H2O)(18) (2) was isolated as a dark violet solid, which readily dissolves in organic solvents. Slow evaporation of solutions of 2 on solid substrates forces the hydrophobic particles to aggregate into a cubic lattice. Annealing these so-formed films at elevated temperature causes de-wetting with terrace formation similar to liquid crystals and block copolymers. Compound 2 forms a stable Langmuir monolayer at the air-water interface; Langmuir-Blodgett multilayers are readily prepared by repeated transfer of monolayers on solid substrates. The films were characterized by optical ellipsometry, Brewster angle microscopy, transmission electron microscopy, and X-ray reflectance.
%0 Journal Article
%1 Kurth2000
%A Kurth, DG
%A Lehmann, P
%A Volkmer, D
%A Colfen, H
%A Koop, MJ
%A Muller, A
%A Chesne, A Du
%C MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY
%D 2000
%I WILEY-V C H VERLAG GMBH
%J CHEMISTRY-A EUROPEAN JOURNAL
%K dgkurth
%N 2
%P 385-393
%T Surfactant-encapsulated clusters (SECs): (DODA)(20)(NH4)H3Mo57V6(NO)(6)O-183(H2O)(18), a case study
%V 6
%X We present a comprehensive study of the partially reduced polyoxomolybdate H3Mo57V6(NO)(6)O-183(H2O)(18)(21-) encapsulated in a shell of dimethyldioctadecylammonium (DODA) surfactant molecules. Treatment of an aqueous solution of (NH4)(21)H3Mo57V6-(NO)(6)O-183(H2O)(18). 65H(2)O (1a) with a trichloromethane solution of the surfactant leads to instant transfer of the encapsulated complex anion into the organic phase. Results from vibrational spectroscopy, analytical ultracentrifugation, small-angle X-ray scattering, transmission electron microscopy, elemental analysis, and Langmuir compression isotherms are consistent with a single polyoxometalate core encapsulated within a shell of 20 DODA molecules. The molar mass of the supramolecular assembly is 20 249 g mol(-1) and the diameter is 3.5nm. A material with the empirical formula (DODA)(20)(NH4)H-3-Mo57V6(NO)(6)O-183(H2O)(18) (2) was isolated as a dark violet solid, which readily dissolves in organic solvents. Slow evaporation of solutions of 2 on solid substrates forces the hydrophobic particles to aggregate into a cubic lattice. Annealing these so-formed films at elevated temperature causes de-wetting with terrace formation similar to liquid crystals and block copolymers. Compound 2 forms a stable Langmuir monolayer at the air-water interface; Langmuir-Blodgett multilayers are readily prepared by repeated transfer of monolayers on solid substrates. The films were characterized by optical ellipsometry, Brewster angle microscopy, transmission electron microscopy, and X-ray reflectance.
@article{Kurth2000,
abstract = {We present a comprehensive study of the partially reduced polyoxomolybdate {[}H3Mo57V6(NO)(6)O-183(H2O)(18)](21-) encapsulated in a shell of dimethyldioctadecylammonium (DODA) surfactant molecules. Treatment of an aqueous solution of (NH4)(21){[}H3Mo57V6-(NO)(6)O-183(H2O)(18)]. 65H(2)O (1a) with a trichloromethane solution of the surfactant leads to instant transfer of the encapsulated complex anion into the organic phase. Results from vibrational spectroscopy, analytical ultracentrifugation, small-angle X-ray scattering, transmission electron microscopy, elemental analysis, and Langmuir compression isotherms are consistent with a single polyoxometalate core encapsulated within a shell of 20 DODA molecules. The molar mass of the supramolecular assembly is 20 249 g mol(-1) and the diameter is 3.5nm. A material with the empirical formula (DODA)(20)(NH4){[}H-3-Mo57V6(NO)(6)O-183(H2O)(18)] (2) was isolated as a dark violet solid, which readily dissolves in organic solvents. Slow evaporation of solutions of 2 on solid substrates forces the hydrophobic particles to aggregate into a cubic lattice. Annealing these so-formed films at elevated temperature causes de-wetting with terrace formation similar to liquid crystals and block copolymers. Compound 2 forms a stable Langmuir monolayer at the air-water interface; Langmuir-Blodgett multilayers are readily prepared by repeated transfer of monolayers on solid substrates. The films were characterized by optical ellipsometry, Brewster angle microscopy, transmission electron microscopy, and X-ray reflectance.},
added-at = {2011-01-12T11:47:20.000+0100},
address = {MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY},
affiliation = {Kurth, DG (Reprint Author), Max Planck Inst Colloids \& Interfaces Golm, D-14424 Potsdam, Germany. Max Planck Inst Colloids \& Interfaces Golm, D-14424 Potsdam, Germany. Univ Bielefeld, D-33501 Bielefeld, Germany. Max Planck Inst Polymerforsch, D-55021 Mainz, Germany.},
author = {Kurth, DG and Lehmann, P and Volkmer, D and Colfen, H and Koop, MJ and Muller, A and Chesne, A Du},
biburl = {https://www.bibsonomy.org/bibtex/219c81b214c22319c785c6cf61ad7b007/lctm},
doc-delivery-number = {277JV},
interhash = {66bd92e3eced5beaa64124a3a8a5abc5},
intrahash = {19c81b214c22319c785c6cf61ad7b007},
issn = {0947-6539},
journal = {CHEMISTRY-A EUROPEAN JOURNAL},
journal-iso = {Chem.-Eur. J.},
keywords = {dgkurth},
keywords-plus = {LANGMUIR-BLODGETT-FILMS; SCATTERING EXPERIMENTS; COLLOIDAL PARTICLES; SIZE DISTRIBUTION; THIN-FILMS; POLYOXOMETALATE; SUPERLATTICES; NANOCRYSTALS; MOLYBDENUM; MONOLAYERS},
language = {English},
month = JAN,
number = 2,
number-of-cited-references = {52},
pages = {385-393},
publisher = {WILEY-V C H VERLAG GMBH},
subject-category = {Chemistry, Multidisciplinary},
times-cited = {137},
timestamp = {2011-01-12T11:47:20.000+0100},
title = {Surfactant-encapsulated clusters (SECs): (DODA)(20)(NH4){[}H3Mo57V6(NO)(6)O-183(H2O)(18)], a case study},
type = {Article},
unique-id = {ISI:000084931200021},
volume = 6,
year = 2000
}