Complexation of copper(II) with 3-(2-hydroxyphenylazo)pentadione-2,4

Quantum-chemical calculations, tautomeric, thermodynamic, spectroscopic and X-ray studies of 3-(4-fluorophenylhydrazone)pentane-2,4-dione

“…The presence of one heterodienic system, HN-N]C-C]O, forming a fairly weak heteronuclear RAHB, N-H/O, has been supported by crystallographic data, and length of this distance N/O 2.5872(12) Å falls in the middle of the N/O distances range, 2.538-2.597 Å, as observed in previous studies on b-diketo-arylhydrazones [28]. This might be useful in the design of functional materials attributed to smart hydrogen bonding [6][7][8][9][10][11], photo-triggered structural switching [43], and targeted metal ion complexes [1][2][3][4][5][13][14][15].…”

“…ADB's enjoy manifold applications, that include its use as a semiconductor [12], an analytical reagent for spectrophotometric determination of metal ions [13][14][15], high-density recordable optical storage [16], spin-coating films [17] liquid crystals [18], self-assembled layers [19] and organic synthesis [20]. The RAHB model [21] was employed to interpret both the intra-and inter-molecular hydrogen bonds within compounds that contain a b-diketo-enol fragment.…”

“…2)-H(N2)/O(2) x, y, z 0.9070(13) 2.5872(12) 1.9160(13) 129.16(12) C(2)-H(2)/O(2)Àx, 1Ày, Àz 0.9492(14)3.4474(17)2.5380(14) 160.10(12) …”

Ion Pairs of 5,5-dimethyl-2-(2-hydroxy-3,5-disulfophenylhydrazo)cyclohexane-1,3-dione with Cationic Surface-Active Substances as Analytical Reagent for Determination of Copper(II)

“…The ADB and their metal complexes are known to exist in different tautomeric forms, which can substantially complicate their study (Gadjieva, Pashaev et al 2007;Gadjieva et al 2008;Alieva et al 2009). In addition, since the tautomers of a compound usually differ in thermodynamic stability, the equilibrium constants of complexation should differ for different tautomers of a ligand Gadjieva, Mursalov, Mahmudov, Pashaev et al 2006). Meanwhile, the close values of M-O bond lengths in chelating rings of b-diketone complexes usually prevent the estimate of the contribution of a certain tautomeric form Skopenko et al 2004).…”

Poly(vinyl) chloride membrane copper-selective electrode based on 1-phenyl-2-(2-hydroxyphenylhydrazo)butane-1,3-dione

“…Therefore, we decided to prepare a new inexpensive electrode with better parameters at least for some of the above mentioned points. Previously, it was shown that azoderivatives of ␤-diketones (ADB) have a rich tautomeric potential (Scheme 1) and can be used for the classical spectrophotometric determination of copper(II) [65][66][67][68][69][70]. It was concluded that when azoderivatives of unsymmetric ␤-diketones are used, the number of ADB tautomers increases along with selectivity of copper analysis [65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81].…”