A novel unsymmetric bis(salamo)-based chemosensor for detecting Cu2+ and continuous recognition of amino acids

Influence of structural variation of salamo‐based ligand on supramolecular architectures, Hirshfeld analyses, and fluorescence properties of new tetranuclear NiII complexes

“…[25,31] The C N stretching bands of the free ligands H 2 L 1 and H 2 L 2 are found at approximately 1,609 and 1,599 cm −1 and reduced to low frequencies of approximately 1,598 and 1,590 cm −1 in complexes 1 and 2, which indicates that the Ni II atoms are bonded to the oxime nitrogen atoms of the deprotonated ligand (L) 2− units. [30,46] The characteristic peaks of Ar−O groups in H 2 L 1 and H 2 L 2 are observed at approximately 1,268 and 1,246 cm −1 . Due to the coordination of the Ni II atoms, the characteristic peaks of Ar−O groups in complexes 1 and 2 appear at approximately 1,257 and 1,219 cm −1 .…”

“…The preparation of 1,2-bis (aminooxy)ethane has been reported in similar references previously. [30,31]…”

“…[20,27,28] Compared with the classic salen-based ligands, the salamo-based ligands are less prone to hydrolysis and have better stabilities. [29,30] Because salamo-based ligands can react with transition metal ions to form complexes, [31][32][33] this makes salamo-based complexes widely studied in the fields of synthesis, [34,35] crystallography, [36][37][38] fluorescence, [39][40][41] and sensors. [42][43][44] In addition, multinuclear metal complexes have potential applications in the field of coordination chemistry.…”

Investigation of mononuclear, dinuclear, and trinuclear transition metal (II) complexes derived from an asymmetric Salamo‐based ligand possessing three different coordination modes

“…[23,24] After modification of Salen-based compounds, two more electronegative oxygen atoms were introduced into the Schiff base nitrogen atoms to form Salamo-based compounds. [25][26][27][28][29][30][31][32] In this paper, an asymmetric Salamobased ligand H 2 L was synthesized first, and the single crystals of the Cu (II), Co (II), and Ni (II) complexes were cultured successfully. For the ligand H 2 L, this was a new Salamo-based compound synthesized for the first time.…”

Insights into crystal structures, supramolecular architectures and antioxidant activities of self‐assembled fluorescent hetero‐multinuclear [Cu (II)‐Ln (III)] (Ln = La, Ce, Pr and Nd) salamo‐like complexes

“…[ 6–12 ] Rare earth, as an indispensable key material in modern society, has attracted more and more attention due to its scarcity of output and value. [ 13,14 ] In recent years, in the research and development of functional materials, the introduction of rare earth elements with unique 4f electronic layer structure and unique physical and chemical properties has been widely developed at home and abroad, and has made great progress, which have open novel possibilities for a broad range of advanced applications, such as electrochemistry, [ 15–18 ] supramolecular buildings, [ 2,19–23 ] catalysis fields, [ 24–26 ] magnetism, [ 27–31 ] biological systems, [ 32–34 ] chemical sensors, [ 35–40 ] luminescence materials, [ 41–45 ] and DFT calculations. [ 46–48 ] Recently, many novel structural 3d–4f complexes have been reported by using salen‐like and salamo‐like N 2 O 2 ‐donor ligands, which also attracted people's attentions.…”