Rions. crystalline Aztreonam site properties of structure, and liquid crystalline properties of these compounds are discussed these compounds are discussed around the basis of your tuned metathesis, structural variables. basis of the tuned structural variables. The thermotropic properties of this series around the The thermotropic properties of this series of salts happen to be investigated by asalts happen to be investigated by a mixture of differential scanning calorimetry and of mixture of differential scanning calorimetry and polarized optical microscopy. polarized optical microscopy.This workPrevious workChart 1. Structures1. Structures with the 12 perfluoroheptyl 1,2,4-oxadiazolylpyridinium salts 1a-f and 2a-f function and Chart in the 12 perfluoroheptyl 1,two,4-oxadiazolylpyridinium salts 1a-f and 2a-f investigated in this investigated in this perform as well as the perfluoroheptyl 1,two,4-oxadiazolyl N-methylpyridinium salts the perfluoroheptyl 1,2,4-oxadiazolyl N-methylpyridinium salts reported in preceding function [9,10]. reported in previous operate [9,10].2. Supplies and Solutions 2.1. Common two. Components and Methods2.1. Generalspectra had been recorded on a Bruker AC 250 E spectrometer employing chloroformd (99.80 , VWR Chemicals) (CDCl3 ) or acetonitrile-d3 (99.80 VWR Chemicals) (CD3 CN) options. Reversed Phase HPLC/ESI/Q-TOF HRMS experiments: Water and acetonitrile have been of HPLC/MS grade. Formic acid was of analytical quality. The HPLC program was an1 H-NMRAppl. Sci. 2021, 11,3 ofAgilent 1260 Infinity. A reversed-phase C18 column (ZORBAX Extended-C18 two.1 50 mm, 1.8 ) having a Phenomenex C18 safety guard column (4 mm three mm) was utilised. The flow price was 0.four mL/min plus the column temperature was set to 30 C. The eluents have been formic acid-water (0.1:99.9, v/v) (phase A) and formic acid-acetonitrile (0.1:99.9, v/v) (phase B). The following gradient was employed: 00 min, linear gradient from five to 95 B; 105 min, washing and reconditioning of your column to five B. The injection volume was 10 . The eluate was monitored via MS TIC. Mass spectra have been obtained on an Agilent 6540 UHD accurate-mass Q-TOF spectrometer equipped using a Dual AJS ESI supply working in optimistic mode. N2 was employed as desolvation gas at 300 C as well as a flow rate of 9 L/min. The nebulizer was set to 45 psi. The Sheath gas temperature was set at 350 C and a flow of 12 L/min. A prospective of three.5 kV was employed on the capillary for optimistic ion mode. The fragmentor was set to 175 V. MS spectra had been recorded within the 150000 m/z variety. Polarized optical microscopy (POM) evaluation in the compounds had been carried out by a Zeiss Axioskop 40Pol microscope equipped using a Linkham hot-stage and a Mettler FP90 central processor to manage the temperature. The evaluation was performed together with the samples placed amongst a glass slide and also a cover slip. The samples had been heated and cooled with a price of 10 C min-1 . An InfinityX-21 MP digital camera mounted atop the microscope allows to capture photomicrographs. Photos had been recorded at magnifications of 100or 200and cross-polarized light. Differential scanning calorimetry (DSC) measurements have been carried out using a TA Instruments mod. 2920 Differential Scanning Calorimeter having a TA Instruments Refrigerated FAUC 365 Purity Cooling Technique. Samples were ready in aluminum TA Tzero Hermetic Pans and Lids (T121019, T121106, created in Switzerland) making use of SCALTEC (d = 0.01/0.1 mg) as the analytical balance. The sample size was of your order of 4 mg for every sample. The evaluation was carried out with heating and cool.