From Mesomorphic Phosphine Oxide to Clustomesogens Containing Molybdenum and Tungsten Octahedral Cluster Cores

• DOI: 10.1002/anie.201503205
• Publication Date: 2015-07-24T20:27:29Z
• Authors: Viorel Cîrcu; Yann Molard; Maria Amela‐Cortes; Ahmed Bentaleb; Philippe Barois; Vincent Dorcet; Stéphane Cordier
• Keywords: Mesogen; Triphenylphosphine oxide

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 (M6 Cl(i) 8 )(4+) octahedral cluster cores (M=Mo, W). The LC properties were studied a combination of polarizing optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray powder diffraction analyses. While the organic showed various mesophase types ranging from nematic, SmA columnar (SmACol ), SmA, SmC phases, it turned out that corresponding formed layered phases (SmA) over wide range temperatures depend nature density mesogenic groups employed. Intrinsic luminescence precursors are preserved entire phase existence.