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Chemically Bonded Hybrid Systems from Functionalized Hydroxypyridine Molecular Bridge: Characterization and Photophysical Properties
Author(s) -
Yan Bing,
Qian Kai
Publication year - 2009
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2009.00596.x
Subject(s) - covalent bond , hybrid material , isocyanate , photoluminescence , intramolecular force , materials science , luminescence , elastomer , chemical engineering , polymer chemistry , chemistry , nanotechnology , organic chemistry , composite material , polyurethane , optoelectronics , engineering
Abstract A series of novel photoactive hybrid materials with organic parts covalently linked to inorganic parts via the acylamino group have been assembled by sol–gel process. The organic parts as molecular bridge derive from α‐hydroxypyridine (HP) functionalized by 3‐(triethoxysilyl)‐propyl isocyanate (TESPIC). Finally homogeneous, molecular‐based hybrid materials with different microstructure (uniform spherical or clubbed) are obtained, in which no phase separation is observed. This may be ascribed as the different coordination behavior of metal ions (Eu 3+ (Tb 3+ ) or Zn 2+ ). Red emission of Eu–HP–Si, green emission of Tb–HP–Si and violet‐blue luminescence of Zn–HP–Si hybrids can be achieved within these molecular‐based hybrid materials. Besides, both Eu(Tb) and Zn are introduced into the same hybrid systems (Eu(Zn)–HP–Si or Tb(Zn)–HP–Si) through the covalent Si–O bond, whose sphere particle size can be modified. Especially the photoluminescence behavior can be enhanced, suggesting that intramolecular energy transfer takes place between inert Zn 2+ and Eu 3+ (Tb 3+ ) in the covalently bonded hybrid systems.