4.6 Article

Host-Guest and Photophysical Behavior of Ti8L12 Cube with Encapsulated [Ti(H2O)(6)] Species

Journal

CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 54, Pages 14358-14362

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201802930

Keywords

cage compounds; coordination assembly; host-guest systems; photophysics; titanium

Funding

  1. NSFC [21425102, 21473202, 21403235, 21521061, 21673238]
  2. Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
  3. FJKJT [2017J06009]
  4. XAFCA beamline of Singapore Synchrotron Light Source
  5. Beijing Synchrotron Radiation Facility [1W1B]

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Titanium-based coordination cages could be interesting for both supramolecular and photophysical chemistry. This work reports an unprecedented host-guest system, [Ti(H2O)(6)]@Ti8L12, which is comprised of the first Ti-based coordination cube and the unusual titanium aquo species. Due to the abundant intra-cube O-H center dot center dot center dot O hydrogen bonds, the [Ti(H2O)(6)]@Ti8L12 complex is rather stable both in solid and solution states, confirmed by X-ray diffraction and ESI-MS analysis. The encapsulated [Ti(H2O)(6)] species shows influence on the light absorption, photoluminescent, and photocurrent properties. Moreover, ultrafast transient absorption spectroscopy has been applied to study the photodynamics of both free and [Ti(H2O)(6)] guest encapsulated Ti8L12 cube, confirming that the host-guest system produces a slightly longer-lived excited state. Therefore, this work presents the first [Ti8L12] cube with unusual [Ti(H2O)(6)] guest and also provides an interesting supramolecular model for the host-guest photophysical study.

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