New Transition and Actinide Metal Complexes of 2‐Carboxy‐phenylhydrazo‐Benzoylacetone Ligand: Synthesis,Characterization and Biological Study

A new series of binary mononuclear complexes were prepared from the reaction of the hydrazone ligand, 2-carboxyphenylhydrazo-benzoylacetone (H2L), with the metal ions, Cd(II), Cu(II), Ni(II), Co(II), Th(IV) and UO2(VI). The binary Cu(II) complex of H2L was reacted with the ligands 1,10-phenanthroline or 2-aminopyridine to form mixed-ligand complexes. The binary complexes of Cu(II) and Ni(II) are suggested to have octahedral configurations. The Cd(II) and Co(II) complexes are suggested to have tetrahedral and/or square-planar geometries, respectively. The Th(IV) and UO2(VI) complexes are suggested to have octahedral and dodecahedral geometries, respectively. The mixed-ligand complexes have octahedral configurations. The structures of all complexes and the corresponding thermal products were elucidated by elemental analyses, conductance, IR and electronic absorption spectra, magnetic moments, 1H NMR and TG-DSC measurements as well as by mass spectroscopy. The ligand and some of the metal complexes were found to activate the enzyme pectinlyase.     

On the Spectrum of a Class of Strongly Coupled p-Laplacian Systems

Consider the nonlinear coupled elliptic system     

Synthesis and characterization of optically active and organosoluble poly(amide-imide)s containing imidazole rings as pendent groups by direct polycondensation

Six new optically active poly(amide-imide)s(PAIs) 6a-f were prepared by direct polycondensation reaction of N-trimelli-tylimido-L-histidine 4 as a chiral diacid with various aromatic diamines 5a-f.Triphenyl phosphite(TPP)/pyridine(Py) in the presence of calcium chloride(CaCl2) and N-methyl-2-pyrrolidone(NMP) were successfully applied to direct polycondensation reaction.The resulting new polymers were in good yields,and had inherent viscosities ranging between 0.29 and 0.41 dL g-1 and were detected with elem...     

A Two-parameter Family of Two-level Higher Order Difference Methods for the Two-dimensional Heat Equation

An algorithm for generating multi-parameter families of differenceoperators on rectangular grids to approximate linear partialdifferential equations has been developed. It has been appliedto construct a twelve-parameter, eighteen point, two-level familyfor the two-dimensional heat equation. Many familiar differenceoperators can be obtained as special cases. A complete analysisof all possibilities has not been attempted. Only the two-parametersubset that has O(h⁶) truncation errors has been studied indetail here. Truncated power series expansions of the operators are usedto construct Vandermonde matrices, whose inverses can be foundby use of familiar algorithms. These Vandermonde matrices constitutethe essential feature of the algorithm, permitting the methodto be used, with minor modifications, to establish differenceoperators that include boundary points; to deal with equationswith variable coefficients; and to deal with irregular (non-rectangular)nets. These possibilities indicate directions for the developmentof a digital computer algorithm to generate difference operatorsfor partial differential equations.