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Manoj Kumar Vandana Sharma Nee Bhalla Virinder Kumar Mangal Singh Gurmit Singh 《Journal of inclusion phenomena and macrocyclic chemistry》2001,39(3-4):241-245
New macrocyclic polyaza compoundscontaining the 1-methylpyrazole moiety are synthesizedin high yield by [2+2]dipodal condensation andreduction. The ring contracted structure of the Schiffbase has been elucidated by NMR. Two of thesemacrocycles form dinuclear complexes with copper andsilver. Macrocyclic Schiff base 5a extracts74.5% silver from aqueous to organic phase. 相似文献
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M.P. Sathisha Naveen V. Kulkarni Srinivasa Budagumpi B.N. Kirasur 《Supramolecular chemistry》2013,25(5):342-350
The novel phenol and phthalazine-based symmetric compartmental 26-membered polyaza macropolycyclic ligand LH2, was synthesised, incorporating 2,6-diformyl-p-cresol and 1,4-dihydrazinophthalazine via 1:1 condensation. Its coordination behaviour with CuII and ZnII ions was investigated. The tetranuclear complexes [M4μ(Cl2)(L)Cl4]·2H2O exhibited aremarkably high stability, suggesting that, along with the large number of nitrogen donors available for metal binding, deprotonated phenolic functions were also involved in binding the metal ion. Incorporation of the bridging units into the macrocyclic cavity influenced electronic communications between the metal ions. 相似文献
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Adriana Dijanoi Sneana Miljani Ivo Piantanida Jorge Gonzlez‐García Enrique García‐Espaa 《Journal of Raman spectroscopy : JRS》2014,45(10):863-872
Surface‐enhanced Raman scattering spectroscopy (SERS) in the near‐infrared region had been applied to study interactions of polyaza pyridinophanes with single stranded RNA and double stranded DNA and RNA polynucleotides. Studied compounds, PYPOD and PHENPOD, differed in the central aromatic moiety, pyridine and phenanthroline, respectively, which linked two cyclic amines. An intense scattering was obtained from molecules adsorbed onto the silver nanoparticles, showing nonlinear concentration dependence in the 6.5 × 10−8−6.5 × 10−5 M range. New bands in spectra of PYPOD/polynucleotide and PHENPOD/polynucleotide mixtures were assigned to vibrational modes of polynucleotide moieties involved in interactions. SERS spectra of both polyaza pyridinophanes with single stranded RNA polynucleotides indicated hydrogen bonding between the small molecules and the nucleic bases of poly A, poly C and poly U, whereas an interaction of only PYPOD with poly G was suggested. SERS spectra implied that both compounds bound into the minor groove of the helical poly dAdT–poly dAdT polynucleotide, while none of polyaza pyridinophanes interacted with the grooves of the poly dGdC–poly dGdC polynucleotide. Nevertheless, intensity ratios suggested intercalation of the phenanthroline moiety of the PHENPOD molecules into the double helix of the guanine‐cytosine polynucleotide. Spectral features also indicated binding of the PYPOD molecules within the major groove of the double stranded RNA analog. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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