REGULATION OF π··· π STACKING INTERACTIONS BETWEEN TRIIMIDAZOLE LUMINOPHORES AND COMPREHENSIVE EMISSION QUENCHING BY COORDINATION TO Cu(II)

Eight Cu(II) coordination compounds with cyclic triimidazole, triimidazo[1,2-a:1’,2’-c:1”,2”-e][1,3,5]-triazine (L1), its positional isomer, triimidazo[1,2-a:1’,2’-c:1”,5”-e][1,3,5]-triazine (L2), and two pyridine derivatives of L1, 3-(pyridin-2-yl)triimidazo[1,2-a:1',2'-c:1'',2''-e][1,3,5]triazine (L3) and 3-(pyridin-4-yl)triimidazo[1,2-a:1',2'-c:1'',2''-e][1,3,5]triazine (L4) are reported. All compounds represent...

An integrated electrocatalytic nESI-MS platform for quantification of fatty acid isomers directly from untreated biofluids

An electrocatalytic nESI MS platform enables positional isomer differentiation through the localization of CC bonds in fatty acids present in complex biofluids.

X-Ray Crystal Structures and Organogelator Properties of (R)-9-Hydroxystearic Acid

(R)-9-hydroxystearic acid, (R)-9-HSA, is a chiral nonracemic hydroxyacid of natural origin possessing interesting properties as an antiproliferative agent against different cancer types. Considering its potential application for medical and pharmaceutical purposes, the structures and rheological properties of (R)-9-HSA were investigated. Oscillatory rheology measurements reveal that (R)-9-HSA gels only paraffin oil, with less efficiency and thermal stability than its positional isomer (R)-12-HSA. Conversely, (R)-9-HSA affords crystals from methanol, acetonitrile, and carbon tetrachloride. The single crystal structures obtained both at 293 K and 100 K show non-centrosymmetric twisted carboxylic acid dimers linked at the midchain OHs into long, unidirectional chains of hydrogen bonds, owing to head-tail ordering of the molecules. Synchrotron X-ray powder diffraction experiments, performed on the solids obtained from different solvents, show the occurrence of polymorphism in paraffin oil and through thermal treatment of the solid from methanol.