Ditopic complex formation of the crown-containing 2-styrylbenzothiazole

Monosubstituted ferrocenyl chalcones: Effect of structural changes upon the ability to detect calcium by absorption spectroscopy

“…These results clearly indicate that complexation involves the azacrown ring. The L 2 M species may correspond to the formation of a sandwich complex, as sometimes reported with organic 15-crown-5 ether derivatives in the presence of Ca 2+ [13,17].…”

Cation‐Dependent Photochromic Properties of Novel Ditopic Receptors

“…Complex formation of CSB 1-3 with alkaline-earth metals and mercury(II) cations was studied by spectrophotometric titration [9,10]. The ratios of CSB 1-3 to Mg 2+ , Ca 2+ , Ba 2+ , or Hg 2+ cations were varied by adding aliquots of solutions containing known concentrations of CSB 1-3 and corresponding metal cations to solutions of CSB 1-3 alone of the same concentrations.…”

Crown-containing styryl derivatives of naphthopyrans: Complexation with alkaline-earth metal cations and photochemistry

“…The synthesis, physical properties, and NMRspectra of 1a (5 [2 (3,4 dimethoxyphenyl)ethenyl] 3,3 diphenyl 3H benzo[f]chromene), 1b (5 [(E) 2 (2,3,5,6,8,9,11,12 [26]. According to NMR data, all of the synthesized com pounds are a mixture of trans and cis isomers (Scheme 3).…”

“…The properties of crown containing organic photochromic compounds have been actively investi gated in the last two decades. The binding of the metal cations by the crown ether moiety leads to changes in the photochromic properties of azobenzenes [7,8], diarylethenes [9], styrylbenzothiazoles [10][11][12], spiropyranes [13][14][15], spirooxazines [16][17][18][19][20][21][22] and chromenes [23][24][25]. This approach opensup the pos sibility of creating photocontrolled receptors.…”