Versatility of 2,6-diacetylpyridine (dap) hydrazones in stabilizing uncommon coordination geometries of Mn(ii): synthesis, spectroscopic, magnetic and structural characterization
作者:Subhendu Naskar、Dipankar Mishra、Shyamal Kumar Chattopadhyay、Montserrat Corbella、Alexander J. Blake
DOI:10.1039/b503891j
日期:——
molecular orbital calculations. A good simulation of the EPR spectrum of a frozen solution (DMSO at 4K) of compound 1 was obtained with g = 2.0, D = 0.1 cm−1, E = 0.01 cm−1. The EPR spectrum of a powdered sample of compound 1 shows a large broadening of the signal, due in part, to the important zero-field splitting of the hepta-coordinated Mn(II) ion.
Versatility of 2,6-diacetylpyridine (dap) hydrazones in generating varied molecular architectures: Synthesis and structural characterization of a binuclear double helical Zn(ii) complex and a Mn(ii) coordination polymer
作者:Subhendu Naskar、Montserrat Corbella、Alexander J. Blake、Shyamal Kumar Chattopadhyay
DOI:10.1039/b615004g
日期:——
also reported. The ability of the 2,6-diacetylpyridine bis(aroyl hydrazone) ligands to form double helical complexes is analyzed in terms of the conformationalflexibility of the ligands. The differences in the magnetic properties of the micro-N bridged binuclear complexes formed by 1,1 azido N-bridging ligands, and pyridine N-bridging ligands, is analyzed with the help of EHMO calculations.
Synthesis and spectral investigation of manganese(II), cadmium(II) and oxovanadium(IV) complexes with 2,6-diacetylpyridine bis(2-aminobenzoylhydrazone): Crystal structure of manganese(II) and cadmium(II) complexes
作者:Kalagouda B. Gudasi、Siddappa A. Patil、Ramesh S. Vadavi、Rashmi V. Shenoy、Munirathinam Nethaji、Sim Wan Annie Bligh
DOI:10.1016/j.ica.2006.03.009
日期:2006.7
coordinate structure for [VO(H2dapa)]SO4 · H2O and seven coordinate structures for [Mn(H2dapa)(Cl)(H2O)]Cl · 2H2O and [Cd(H2dapa)Cl2] · H2O complexes have been proposed. Pentagonal bipyramidal geometry for [Mn(H2dapa)(Cl)(H2O)]Cl · 2H2O and [Cd(H2dapa)(Cl2)] · H2O complexes was confirmed by single crystal analysis. The X-band EPR spectra of the oxovanadium(IV) and manganese(II) complexes in the polycrystalline
Condensed, solution and gas phase behaviour of mono- and dinuclear 2,6-diacetylpyridine (dap) hydrazone copper complexes probed by X-ray, mass spectrometry and theoretical calculations
作者:Brenno A. D. Neto、Barbara F. L. Viana、Thyago S. Rodrigues、Priscila M. Lalli、Marcos N. Eberlin、Wender A. da Silva、Heibbe C. B. de Oliveira、Claudia C. Gatto
DOI:10.1039/c3dt50594d
日期:——
We describe the synthesis of novel mononuclear and dinuclear copper complexes and an investigation of their behaviour in solution using mass spectrometry (ESI-MS and ESI-MS/MS) and in the solid state using X-ray crystallography. The complexes were synthesized from two widely used diacetylpryridine (dap) ligands, i.e. 2,6-diacetylpyridinebis(benzoic acid hydrazone) and 2,6-diacetylpyridinebis(2-aminobenzoic acid hydrazone). Theoretical calculations (DFT) were used to predict the complex geometries of these new structures, their equilibrium in solution and energies associated with the transformations.
我们介绍了新型单核和双核铜配合物的合成,并利用质谱法(ESI-MS 和 ESI-MS/MS)和 X 射线晶体学法研究了这些配合物在溶液中和固态中的表现。这些配合物由两种广泛使用的二乙酰基吡啶(dap)配体合成,即 2,6-二乙酰基吡啶双(苯甲酸腙)和 2,6-二乙酰基吡啶双(2-氨基苯甲酸腙)。理论计算(DFT)被用来预测这些新结构的复杂几何形状、它们在溶液中的平衡以及与转化相关的能量。
Investigation into aroylhydrazones as chelating agents. Part 7. Synthesis and spectroscopic characterization of complexes of Mn II , Co II , Ni II , Cu II , and Zn II with 2,6-diacetylpyridine bis(2-aminobenzoylhydrazone) and X-ray structure of chloro[2,6-diacetylpyridine bis(2-aminobenzoylhydrazone)](methanol)manganese(II) chloride monohydrate
with metal chlorides and acetates. The i.r. spectra are reported and evaluated to obtain information on the co-ordinating behaviour of the hydrazone. An X-ray diffraction analysis carried out on [Mn(H2dapab)(CH3OH)Cl]Cl·H2O has shown it to possess pentagonal-bipyramidal geometry with the H2dapab ligand occupying the equatorial plane and the Cl and CH3OH groups at the axial sites. The structure has been