Using
pyrene and anthracene monocarboxylate chromophores two metal–organic
complexes, {[Cd(pma)2(o-phen)2]·2H2O·MeOH)}
n
(1) and {Cd2(μ-H2O)(amc)4(o-phen)2}
n
(2) (Hpma = pyrene
monocarboxylic acid; Hamc = 9-anthracene monocarboxylic acid; o-phen = orthophenanthroline) have been synthesized, respectively
and characterized using a single crystal X-ray diffraction study.
Compound 1 contains a seven-coordinated Cd2+ center connected by two o-phen and two pma, where
one pma and o-phen pair stacks in a face-to-face
fashion, and the other pma:o-phen pair is linked
through C–H···π interaction. Compound 2 is a dimeric complex of Cd2+ reported previously,
and it contains two pairs of face-to-face stacked amc:o-phen. Compound 1 shows a red-shifted bright cyan emission
compared to pma monomer emission that can be attributed to pma:o-phen exciplex formation. This exciplex emission is further
sensitized by another pma through a Förster resonance energy
transfer (FRET) process. Similarly in the case of 2,
amc:o-phen exciplex emission is sensitized through
FRET from the other amc linker in the solid state, while in methanol
such an energy transfer process is perturbed resulting in a dual emission
related to a monomer of amc and exciplex of amc:o-phen. Interestingly, the blue emission of 2 dispersed
in methanol changes to a bright cyan-green emission upon addition
of Al3+ and remains almost unchanged or slightly affected
with other metal ions leading to selective chemosensing of Al3+. Moreover, the density functional theory based calculations
provide clear evidence of ground state interactions between pma:o-phen and amc:o-phen in 1 and 2, respectively.
Five isostructural 1D porous coordination polymers (PCPs) of TbIII (1), EuIII (2), YbIII (3), NdIII (4) and ErIII (5) have been synthesized using a flexible tripodal organic linker and characterized....
The thermoluminescence (TL) properties of calcium aluminate (CaAl 2 O 4) doped with different rare earth ions have been studied and their suitability for radiation dosimetry applications is discussed. It is observed that monocalcium aluminate doped with cerium is a good dosimeter having linear response up to about 4 kGy of radiation doses. Dopant concentration of 0⋅ ⋅25 mol% cerium gives maximum TL emission. The well-defined single peak observed at 295°°C can be advantageously used for high temperature dosimetry applications.
Based on rational design and synthesis approach, a pyrene based supramolecular flexible porous framework of Zn(ii) has been synthesized. It shows excimer emission and has been exploited for light harvesting application.
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