Wyniki wyszukiwania - BazTech

1

Synthesis, Crystal Structure and DNA Binding Studies of Bis(piperidinium)bis-(N,N,N',N'-tetramethylethylenediammonium) Decavanadate(V) Tetrahydrate

Jiang M., Li Y. -T., Wu Z. -Y., Yan C. -W.

Polish Journal of Chemistry

|

2009

|

Vol. 83, nr 11

1849-1858

EN

A new decavanadate compound consisting of one decavanadate polyanion [V10O28]6–, two protonated piperidinium cations [C5H12N]+, two doubly protonated N,N,N',N'- tetramethylethylenediammonium cat ions [C6N2H18]2+ and four lattice water molecules, namely, [(C5H12N)2][(C6N2H18)2][V10O28]×4H2O, has been synthesized and characterized by spectroscopic (IR, UV-vis and ESR) studies and single-crystal X-ray diffraction. It crystallizes in the monoclinic system, space group P21/n and Z = 2, with a = 11.1267(18) capital A, ring, b = 16.854(3) capital A, ring, c = 12.973(2) capital A, ring and beta = 95.426(2)°. The cat ions, an ions and lattice water molecules are assembled by hydrogen bonds, forming a three-dimensional supramolecular architecture. The DNA-binding property of the compound was preliminarily investigated by using fluorescence spectrum, and the results indicating that the interaction mode between the compound and herring sperm DNA (HS-DNA) might be groove binding with the quenching constant of 1.20×104. To the best of our knowledge, this is the first report about the DNA-binding study of decavanadate compounds.

2

Synthesis and Magnetism of Copper(II)-Lanthanoid(III) Heterobinuclear Complexes with N,N'

Li Y.-T., Yan C. -W., Wang G.-M.

Polish Journal of Chemistry

|

2002

|

Vol. 76 / nr 5

653-662

EN

Eleven novel ž-oxamido-bridged copper(II)-lanthanoid(III) heterobinuclear complexes described by the overall formula Cu(obp)Ln(Ph2-phen)2ClO4 (Ln = Y, La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb), where obp denotes N,N_-oxamidobis(propionato) and Ph2-phen represents 4,7-diphenyl-1,10-phenanthroline (Ph2-phen), have been synthesized and characterized by elemental analyses, spectroscopic (IR, UV, ESR) studies, and molar conductivity measurements. The temperature dependence of the magnetic susceptibility of complex Cu(obp)Gd(Ph2-phen)2ClO4 has been measured over the range 4.2~300 K and the magnetic properties were studied in detail, demonstrating the presence of a very weak ferromagnetic interaction between the adjacent Gd(III) and Cu(II) ions through the oxamido-bridge. Based on the spin Hamiltonian operator, _ _ _ H = 2JS S 1 2 _ _ , the exchange integral (J) was evaluated as +2.98 cm-1. A plausible mechanism for the ferromagnetic coupling between Gd(III) and Cu(II) is discussed in terms of spin-polarization.

3

Synthesis and Magnetic Properties of mi-Oxalato-Bridged Cu(II)-Fe(III)-Cu(II) Heterotrinuclear Complexes

Wang H. D., Li Y. -T., Yan C. -W., Zeng X.-C.

Polish Journal of Chemistry

|

2002

|

Vol. 76 / nr 5

637-644

EN

Three new _-oxalato-bridged copper(II)-iron(III)-copper(II) heterotrinuclear complexes described by the overall formula [Cu2Fe(ox)3L2]ClO4, where ox represents the oxalato dianions and L stands for 5-phenyl-1,10-phenanthroline (Ph-phen), 4,7-diphenyl- 1,10-phenanthroline (Ph2-phen) or 5-chloro-1,10-phenanthroline (Cl-phen), have been synthesized and characterized by elemental analyses, molar conductivity and magnetic moment (at room-temperature) measurements, IR and electronic spectral studies. It is proposed that these complexes have extended ox-bridged structures, consisting of two copper(II) and an iron(III) ions, in which the central iron(III) ion has an octahedral environment and the end capped two copper(II) ions have a square-planar environment. The variable-temperature susceptibilities of [Cu2Fe(ox)3(Ph-phen)2]ClO4 complex were measured and studied in the 4.2~300 K range. The least-squares fit of the experimental susceptibility based on the spin Hamiltonian operator, _ _ _ H = JS S 1 2 _ _ 2 , yielded J = -9.89 cm-1. The magnetic coupling parameter is consistent with an antiferromagnetic exchange interaction between the copper(II) and iron(III) ions through the oxalato-bridge in the complex.

4

Synthesis and ferromagnetic oxamido-bridged heterodinuclear copper(II)-chromium(III) complexes

Yan C.-W., Li Y.-T.

Polish Journal of Chemistry

|

1998

|

Vol. 72, nr 5

844-851

EN

Four new my-oxamido heterodinuclear complexes [Cu(oxap)Cr(L)2](NO3)3, where oxap denotes the N