Herein, we report a series of 9‐(diphenylphosphoryl)‐10‐(phenylethynyl)anthracenes (DPPPEAs) as novel fluorescent 9,10‐disubstituted anthracene derivatives. The DPPPEAs were prepared by Sonogashira coupling of (10‐bromoanthracen‐9‐yl)diphenylphosphine oxide with terminal arylacetylenes, and their structures were fully characterized. UV/Vis fluorescence spectroscopy and theoretical calculations were used to evaluate substituent effects on fluorescence properties of DPPPEAs. The nature of emissive excited state of DPPPEAs was found to vary greatly depending on the substituent, solvent, and temperature. Unsubstituted DPPPEA emitted intense fluorescence from locally excited (LE) state, whereas donor‐acceptor (D‐A) type DPPPEAs substituted with diphenylamino groups showed strong solvatofluorochromism derived from the charge‐transfer (CT) state. Notably, carbazolyl derivatives exhibited fluorescence from LE hybridized with CT state. The disappearance of CT emission in rigid media suggests that solvent reorganization plays a crucial role in producing large Stokes shifts of D‐A type derivatives. The DPPPEAs have also been found to function as annihilators in porphyrin‐sensitized triplet–triplet annihilation processes.
In this study, the NO-donating property of [Ru(BPG)Cl(NO)]Cl (BPG = N,N-bis(2-
pyridylmethyl)glycinato anion) via electrochemical activation was assessed. The synthesized BPG and
[Ru(BPG)Cl(NO)]Cl were characterized by UV-Vis and FT-IR spectroscopy. To determine if NO may
be released from the compound via one-electron reduction, cyclic voltammetric experiments in aqueous
and non-aqueous solutions were performed using a three-electrode cell consisting of glassy carbon
working electrode, Pt wire counter electrode and Ag/AgCl or Ag/Ag+ reference electrode. The
[Ru(BPG)Cl(NO)]Cl complex showed two one-electron reversible reductions in dimethylformamide,
which suggests decreased ability as NO donor. In aqueous solution at pH 2.0, [Ru(BPG)Cl(NO)]Cl
exhibited a one-electron irreversible reduction, which could be assigned to a Ru-NO centered reduction.
The irreversibility of the reduction could be due to NO labilization and suggests that
[Ru(BPG)Cl(NO)]Cl could be a potential NO donor in acidic aqueous medium.
This study aimed to determine the experienced difficulties in Chemistry 70 (Introduction to Physical Chemistry) among ten (10) selected BSE-Chemistry students who had undergone Chemistry 70 and two professors of Physical Chemistry. Qualitative research design with purposive sampling was used in this study. It was found that out of the total 10 BSE-Chemistry respondents, majority got a passing grade of 1.50 to 3.00 in Chemistry 70, representing their academic performance for this particular study. They considered “Chemical Thermodynamics and Equilibrium” as “much difficult” and classified “teacher factor” as the primary reason for the difficulty in understanding the subject. Teachers play a great role in the learning of the students in Physical Chemistry. They must be equipped effectively with the concepts needed for the efficient delivery of lessons in the classroom. Moreover, teachers must be able to relate both theories and concepts to real-life situations for the students to have a better understanding of the subject matter. It was suggested that students should be able to master the basic skills and concepts in Math 61 to improve their mathematical skills which are very much needed in the study of Physical Chemistry.
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