2 research outputs found
Polymorph-Dependent Electrogenerated Chemiluminescence of Low-Dimensional Organic Semiconductor Structures for Sensing
A sensitive electrogenerated chemiluminescence
(ECL) sensor with
an organic semiconductor as active material for detecting trace amounts
of molecules has been highly desired. However, the crystal structure
responses of the ECL properties of the organic semiconductor materials,
that is, structure–property relationship, is not clear, which
limits the development of the sensitive ECL sensors. Herein, for the
first time, we reported a novel concept for molecular-stacking-arrangement-dependent
electrogenerated chemiluminescence properties of organic semiconductor
rubrene microstructures. The rubrene 1D microwires
and 2D hexagonal plates with different polymorphs (triclinic and monoclinic)
were controllably constructed with the reprecipitation method. The
supersaturation of the rubrene molecules plays an important role in
the thermodynamically and kinetically dominated process of growth,
which affects not only the polymorphs but also the morphology of the
obtained microstructures. These microstructures show good optoelectronic
properties, which are used as active ECL materials for the construction
of ECL sensors. The ECL sensors exhibited distinct electrogenerated
chemiluminescence properties, probably related to different inherent
crystal-structure-dependent triplet–triplet annihilation rate
and charge-transfer rate. The sensors manifested electrogenerated
chemiluminescence responses in broad linear range for the monitoring
of creatinine molecules
K<sub>2</sub>CO<sub>3</sub>‑Catalyzed (3 + 2) Cycloaddition Reaction of <i>N</i>‑2,2,2-Trifluoroethylisatin Ketimines with Azodicarboxylates: Access to Spirooxindoles Containing Trifluoromethyl-1,2,4-triazolines
Potassium
carbonate-catalyzed (3 + 2) cycloaddition reaction between N-2,2,2-trifluoroethylisatin ketimines and azodicarboxylates
has been developed, constructing a series of novel N-heterocycle infused spirooxindoles in good to excellent yields (up
to 98%) under milder conditions. The presence of both biologically
active oxindole and trifluoromethyl-1,2,4-triazoline moieties in these
novel spirocyclic compounds would provide new lead structures in the
discovery of heterocyclic compounds with potential pharmaceutical
activities