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From Mesomorphic Phosphine Oxide to Clustomesogens Containing Molybdenum and Tungsten Octahedral Cluster Cores
Author(s) -
Cîrcu Viorel,
Molard Yann,
AmelaCortes Maria,
Bentaleb Ahmed,
Barois Philippe,
Dorcet Vincent,
Cordier Stéphane
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201503205
Subject(s) - mesophase , mesogen , crystallography , triphenylphosphine oxide , differential scanning calorimetry , materials science , luminescence , liquid crystal , molybdenum , cluster (spacecraft) , triphenylphosphine , chemistry , organic chemistry , liquid crystalline , physics , optoelectronics , computer science , metallurgy , thermodynamics , programming language , catalysis
New clustomesogens (i.e., metal atom clusters containing liquid crystalline (LC) materials) have been obtained by grafting neutral cyanobiphenyl (CB)‐ or cholesteryl‐containing tailor‐made dendritic mesomorphic triphenylphosphine oxide ligands on luminescent (M 6 Cl i 8 ) 4+ octahedral cluster cores (M=Mo, W). The LC properties were studied by a combination of polarizing optical microscopy (POM), differential scanning calorimetry (DSC), and X‐ray powder diffraction analyses. While the organic ligands showed various mesophase types ranging from nematic, SmA columnar (SmA Col ), SmA, and SmC phases, it turned out that the corresponding clustomesogens formed layered phases (SmA) over a wide range of temperatures that depend on the nature and density of mesogenic groups employed. Intrinsic luminescence properties of the cluster precursors are preserved over the entire range of LC phase existence.