High-Resolution Characterization of Liquid-Crystalline [60]Fullerenes Using Solid-State Nuclear Magnetic Resonance Spectroscopy | Zendy

Sergey V. Dvinskikh | Zendy; Kazutoshi Yamamoto | Zendy; David Scanu | Zendy; Robert Deschenaux | Zendy; Ayyalusamy Ramamoorthy | Zendy

Open Access

High-Resolution Characterization of Liquid-Crystalline [60]Fullerenes Using Solid-State Nuclear Magnetic Resonance Spectroscopy

Author(s) -

Sergey V. Dvinskikh,

Kazutoshi Yamamoto,

David Scanu,

Robert Deschenaux,

Ayyalusamy Ramamoorthy

Publication year - 2008

Publication title -

the journal of physical chemistry b

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.864

H-Index - 392

eISSN - 1520-6106

pISSN - 1520-5207

DOI - 10.1021/jp803265z

Subject(s) - thermotropic crystal , liquid crystal , mesogen , fullerene , magic angle spinning , materials science , solid state nuclear magnetic resonance , magnetic dipole–dipole interaction , supramolecular chemistry , crystallography , chemical physics , chemical shift , nuclear magnetic resonance spectroscopy , analytical chemistry (journal) , dipole , chemistry , nuclear magnetic resonance , organic chemistry , liquid crystalline , crystal structure , physics , optoelectronics

Liquid-crystalline materials containing fullerenes are valuable in the development of supramolecular switches and in solar cell technology. In this study, we characterize the liquid-crystalline and dynamic properties of fullerene-containing thermotropic compounds using solid-state natural abundance (13)C NMR experiments under stationary and magic angle spinning sample conditions. Chemical shifts spectra were measured in isotropic, liquid-crystalline nematic and smectic A and crystalline phases using one-dimensional (13)C experiments, while two-dimensional separated local-field experiments were used to measure the (1)H- (13)C dipolar couplings in mesophases. Chemical shift and dipolar coupling parameters were used to characterize the structure and dynamics of the liquid-crystalline dyads. NMR data of fullerene-containing thermotropic liquid crystals are compared to that of basic mesogenic unit and mesomorphic promoter compounds. Our NMR results suggest that the fullerene-ferrocene dyads form highly dynamic liquid-crystalline phases in which molecules rotate fast around the symmetry axis on the characteristic NMR time scale of approximately 10 (-4) s.

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