Aggregation-induced-emission-active vinamidinium salts with tunable emissions, reversible mechanochromic response and the application in data-security protection

Synthesis of new allylidene amino phenol-containing Schiff bases and metal complex formation using trimethinium salts

“…At rst, compounds 1 were prepared similar to the previous studies. [18][19][20][21][22][23][24][25] Then the results were treated with aminophenol derivatives to afford the related Schiff base ligands as the desired products. As Table 2 indicates, a variety of trimethinium salts were successfully applied in this process to afford the corresponding Schiff base ligands derivatives as novel compounds with excellent yields.…”

“…One of the useful attributes of many vinamidinium salts is their ease of preparation from substituted acetic acids under Vilsmeier-Haack conditions. [12][13][14][15][16][17][18][19][20][21][22][23] "In this study, our research group was able to prepare bsubstituted trimethinium salts with different R groups (including aryls and heteroaryls) from correspondingly substituted acetic acids, R-CH 2 CO 2 H, with good yields". 24,25 In continuation of this research on applications of trimethinium salts in organic synthesis (Scheme 1), [26][27][28][29][30][31] in this study, we report a new and highly efficient method for the synthesis of a novel class of allylidene amino phenol-containing Schiff bases from the reaction of trimethinium salts and diverse aminophenols in the presence of triethylamine, under catalyst-free conditions in EtOH at reux (Scheme 2).…”

Synthesis, Spectroscopic Characteristics, DFT Study and Dyeing Performance of Bischlorotriazine Based Water‐Soluble Reactive Dyes

“…In addition, the increased coplanarity and π-conjugation extension caused a more apparent redshift (38 nm) in MR1C than in MR1A, substantiating that the introduction of an electron-donating group and the extension of π-conjugation of the dye molecules could affect their excited state properties. [27] To further discern the emission properties, the emissions of MR1A-MR1C were investigated in different solvents, and their emission spectra are shown in Table 2. As illustrated in Figure 2(b)-(d), MR1A-MR1C dyes exhibited a slightly positive solvatochromic effect, which implies that the emitting states in organic solvents possess π-π* states with few charge transfer states.…”

Preparation of 2,5‐disubstituted pyrimidines from vinamidinium salts and synthesis of novel disulfane derivatives

“…In the past decade, much attention has focused on trimethinium salts, which are versatile and unique compounds that serve as three‐carbon building blocks . Positions 1 and 3 of the trimethinium system are electrophilic, and position 2 is weakly nucleophilic.…”

“…[5] In the past decade, much attention has focused on trimethinium salts, which are versatile and unique compounds that serve as three-carbon building blocks. [6][7][8] Positions 1 and 3 of the trimethinium system are electrophilic, and position 2 is weakly nucleophilic. Because of their special electronic distribution characteristics, vinamidinium salts have been applied in many fields including, the preparation of cyanine dyes and sensors, conductive materials and liquid crystal materials.…”