Synthesis, enhanced spectroscopic characterization and electrochemical grafting of N-(4-aminophenyl)aza-18-crown-6: Application of DEPT, HETCOR, HMBC-NMR and X-ray photoelectron spectroscopy

Synthesis of some azacrown derivatives and fabrication of their nanofilms on the glassy carbon surface

“…To confirm their proposed structure, detailed characterization techniques such as FT-IR, 1 H NMR, 13 C NMR, and DEPT were used. Due to the importance of azacrown compounds in the field of analytical chemistry [6], chemical sensors [7,8] and ionic extraction [18] as molecular receptors [19], we also investigated the grafting of PA15C5 and 4APA15C5 on a GC surface to get a new insight into the modification area. The modifications of these molecules onto GC surfaces were verified by CV, XPS, and RAIRS.…”

Squaraine-Based Optical Sensors: Designer Toolbox for Exploring Ionic and Molecular Recognitions

“…Synthetic routes to various functional crown ether motifs have been developed, which makes them suitable building blocks for chemosensor development [52]. Crown ether-containing squaraines have been prepared using a general method (Scheme 3) [53], following a condensation reaction between squaric acid and N-phenyl crown ethers [54][55][56]. Scheme 3.…”

Application of the linear principle for the strongly-correlated variables: Calculations of differences between spectra

“…(6) and (8) the capital letter N shows the limits of the scaling parameters b and n. The function F(z) describes some scaling process that is determined by the limits of the variable z (real or complex). If the asymptotic behavior of this function is finite then at N ) 1 it is reduced to the right-hand of expression (5).…”

“…We chose the value that corresponds to the minimal value of terms N figuring in expression (6). We noticed also that for three remnant functions considered the values of k 0 and contribution of low frequencies (at n < 0) in (6) are negligible and so for this specific case we consider the simplified hypothesis of the type r 1 ðx; n; NÞ ¼ A 0 þ X N n¼0 a n cos X 0 n n x Table 2.…”

“…Literature related to this method is really vast and huge and so it is not represented here [see Refs. [6][7][8][9][10] and the references therein]. We should add here that the integration of the data presented in the linear basic relationship makes the general identification methods more stable with respect to different errors that always present in real measurements.…”