Understanding intermolecular interactions {between|in between|among|amongst|involving} Lewis acid and base pairs is of {fundamental|basic} {importance|significance|value} in predicting non-covalent bonding and chemical reactivity. {Here|Right here} we show that an acridinium derivative, a Lewis acid, exhibits {various|numerous|different|a variety of|several|many} degrees of interactions with Lewis bases of {increasing|growing|escalating|rising} nucleophilicity, {including|such as|which includes|like} water (HOH), methanol (CH3OH), tetrahydrofuran (ROR), amines (R3N) and t-butoxide (RO-). {Each|Every|Each and every|Every single} interaction {appears|seems} to {result in|lead to} a {different|various|distinct|diverse|unique|distinctive} {type|kind|sort|variety|form} of {solution|answer|remedy|resolution|option} state: solvation (e.g., water), coordination (e.g., tetrahydrofuran), chemical bonding (e.g., triethylamine), and radicals (e.g., t-butoxide). The solvated and coordinated acridinium molecules exhibit {almost|nearly|virtually|practically|just about|pretty much} identical 1H-NMR spectra, but possess drastically {different|various|distinct|diverse|unique|distinctive} UV absorption and luminescence emission, {particularly|especially|specifically} phosphorescence; {on the other hand|however|alternatively}, coordinated and chemically bonded acridinium species {which are|that are} differentiated by heat calorimetry titration, share {the same|exactly the same|the identical|precisely the same|the exact same} luminescence spectra but show two {different|various|distinct|diverse|unique|distinctive} sets of 1H-NMR peaks. These distinct {solution|answer|remedy|resolution|option} states could only be revealed by a {combination|mixture} of NMR and molecular fluorescence/phosphorescence spectroscopic {methods|techniques|strategies|approaches|procedures|solutions}, which could {provide|offer|supply|give|present|deliver} {important|essential|crucial|critical|significant|vital} clues {in the|within the|inside the} mechanistic understanding of {many|numerous|several|a lot of|quite a few|lots of} {important|essential|crucial|critical|significant|vital} processes {such as|like|including|for example|for instance|which include} photo-redox reactions. The {current|present|existing} report serves as an {example|instance} of {using|utilizing|making use of|employing|working with|applying} phosphorescence spectroscopy as a complementary tool for characterizing electronic structures for interaction {between|in between|among|amongst|involving} organic molecules. Apixaban Chemical name 149353-72-0 web PMID:24518703
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