首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >Schiff bases and their complexes with metal ions, IV - Synthesis, complex formation and spectral investigation of new tritopic bis(crown ether) compounds containing recognition sites for sodium and nickel guest cations
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Schiff bases and their complexes with metal ions, IV - Synthesis, complex formation and spectral investigation of new tritopic bis(crown ether) compounds containing recognition sites for sodium and nickel guest cations

机译:Schiff碱及其与金属离子的配合物,IV-含有钠和镍客体阳离子识别位点的新型三主题双(冠醚)化合物的合成,配合物形成和光谱研究

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摘要

New bis(crown ether) ligands (1 - 3) of Schiff base type containing recognition sites for sodium and nickel guest cations have been synthesized by the condensation of two equivalents of 4'-formyl-5'-hydroxy(benzo-15-crown-5) with 1,5-diamino-3-azapentane, 1,8-diamino-3,6-diazaoctane or 1,8-diamino-3,6-dioxaoctane. Homonuclear ditopic crystalline 2:1 (Na+:ligand) complexes (1a - 3a) of the ligands with NaClO4 have been prepared. Heteronuclear tritopic crystalline 2:1:1 (Na+ : Ni2+ : ligand) complexes (2b and 3b) have also been synthesized from the reactions of the ditopic complexes (2a and 3a) with Ni(CH3COO)(2) . 6H(2)O. The W-VIS spectra of 1 - 3, their sodium complexes 1a - 3a and sodium-nickel complexes 2b and 3b have been recorded in polar and non-polar solvents as well as in acidic and basic media. In polar solvents and basic solutions, tautomeric equilibria (phenol-imine and keto-amine forms, O-H . . .N reversible arrow O . . .H-N) are present, depending on the hydrogen bonding. The results indicate that the concentrations of the keto forms of the compounds generally increase as the polarity of the solvent increases. [References: 30]
机译:通过两当量的4'-甲酰基-5'-羟基(苯并15-冠)的缩合反应合成了新的Schiff碱型双(冠醚)配体(1-3),其中包含钠和镍客体阳离子的识别位点。 -5)与1,5-二氨基-3-氮杂戊烷,1,8-二氨基-3,6-二氮辛烷或1,8-二氨基-3,6-二氧杂辛烷。已经制备了配体与NaClO 4的同核异位晶体2:1(Na +:配体)配合物(1a-3a)。也已经从对位配合物(2a和3a)与Ni(CH3COO)(2)的反应中合成了异核三位点晶体2:1:1(Na +:Ni2 +:配体)配合物(2b和3b)。 6H(2)O。已经在极性和非极性溶剂以及酸性和碱性介质中记录了1-3,它们的钠配合物1a-3a和钠-镍配合物2b和3b的W-VIS光谱。在极性溶剂和碱性溶液中,取决于氢键,存在互变异构平衡(酚亚胺和酮胺形式,O-H ..N可逆箭头O..H-N)。结果表明,化合物的酮形式的浓度通常随着溶剂极性的增加而增加。 [参考:30]

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