Narrow Results

This paper provides a review of synthesis of the phthalocyanines containing various macrocycles at the peripheral position of the benzene rings. They are expected to be suitable to change the chemical and physical properties toward the need of technologycal applications. In addition, transition and alkali metal phthalocyanine complexes especially rare-earth bis phthalocyanines, are object of intense investigations for their unique optical and electrochemical properties. The methodology of synthesis, purification and yield varies the structural designation which is restricted and depends on the starting compounds.

Let $A$ be a finite-dimensional algebra over an algebraically closed field. We study sections in the Auslander–Reiten quiver of the categories of complexes of fixed size and in the Auslander–Reiten quiver of the bounded derived category. One of the aims of this work is to show where the indecomposable $A$-modules can be found in the Auslander–Reiten quiver of the derived category, whenever $A$ is a piecewise hereditary algebra. We also prove that we can obtain a transjective component of the bounded derived category from a section. As an application of the results of sections, we find a bound on the strong global dimension of some piecewise hereditary algebras of tree type. Moreover, we also determine the strong global dimension of some algebras taking into account their ordinary quivers with relations.

In this paper, we study tensor products of injective modules and exactness of certain naturally appearing complexes of projective and injective modules over Schur superalgebras over an algebraically closed field K of characteristic p > 2. In particular, for the complex of projective modules P(i) = Sξ _{1ⁱ(m+1)^r-i} given by multiplication by u_i = ξ _{1ⁱ(m+1)^r-i, 1ⁱ⁺¹ (m+1)^r-i-1}, we determine all of the terms where it is exact.

A novel NCN type palladium pincer complex based on the porphyrin backbone was synthesized. The palladium atom bound to the meso-carbon of the porphyrin core was effectively supported by two imidazolyl groups. The product was characterized by spectroscopic and X-ray diffraction analysis. The structure of the porphyrinic macrocycle was revealed to be highly distorted by the coordination of the outer palladium center. The degree of deformation was found to be even larger than the analogous palladium pincer complexes in which pyridine groups were employed as the supporting ligands. The complex exhibited high catalytic activity in the Mizoroki-Heck reaction of iodobenzene with butyl acrylate with 0.005% of the catalyst loading.

Novel bi-, tri- and tetranuclear butyl- and tert-butyl-substituted clamshell-type phthalocyanines were synthesized starting from 2-hydroxyphthalocyanines with quantitative yields. The structures of the obtained compounds were characterized by a complex of NMR spectroscopy and mass spectrometry techniques. Applying electronic absorption spectroscopy (UV-vis) and density functional theory (DFT) showed the complicated conformation equilibria for the spacer-bonded macrocyclic compounds and led us to estimate their behavior dependent on the number and relative orientation of macrocycles.

The Ni(II) complex of 5,10,15,20-tetrakis[3${}^{\prime }$,5${}^{\prime }$-di(2${}^{\prime \prime }$-methylbutyloxy)phenyl]porphine was synthesized and characterized by ¹H NMR, UV-vis spectroscopy and MALDI-TOF mass-spectrometry. The stationary phase on the base of synthesized Ni(II) complex was used for chromatographic separation of isomeric methyl- and dimethylpyridines. The high structural selectivity of this sorbent was explained by giving the results of DFT calculation of pyridine derivatives axial complexes with porphyrin Ni(II) complexes.

We review recent progress in molecular magnets especially in the viewpoint of the application for quantum computing. After a brief introduction to single-molecule magnets (SMMs), a method for qubit manipulation by using non-equidistant spin sublevels of a SMM will be introduced. A weakly-coupled dimer of two SMMs is also a candidate for quantum computing, which shows no quantum tunneling of magnetization (QTM) at zero field. In the AF ring Cr₇Ni system, the large tunnel splitting is a great advantage to reduce decoherence during manipulation, which can be a possible candidate to realize quantum computer devices in future.