%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 }