Diacetatobis(2‐amino­benzothia­zole‐κN)cobalt(II)

The title complex, [Co(C₂H₃O₂)₂(C₇H₆N₂S)₂], contains a Co centre with a slightly distorted tetra­hedral coordination geometry, involving two acetate ligands and two N atoms from the thia­zole moiety [Co—O = 2.0025 (14) and 1.9953 (16) Å, and Co—N = 2.0524 (18) and 2.0568 (18) Å]. The inter­planar angle between the two benzothia­zole moieties is 77.86 (3)°. The amine groups, acting as donors, participate in intra‐ and inter­molecular N—H⋯O hydrogen bonds, with N⋯O distances in the range 2.806 (2)–2.857 (2) Å.     

The spectrum of eigenparameter-dependent discrete Sturm-Liouville equations

Let us consider the boundary value problem (BVP) for the discrete Sturm-Liouville equation

     

(Benzo­furan‐2‐yl)(3‐methyl‐3‐phenyl­cyclo­butyl)­methanone

The structure of the title compound, C₂₀H₁₈O₂, consists of a dimeric arrangement of benzo­furan mol­ecules around an inversion centre, linked via C—H⋯O hydrogen bonds. There are also C—H⋯π ring interactions. All these interactions result in the formation of infinite chains parallel to the [100] axis. The cyclo­butane ring is puckered, with a dihedral angle of 29.03 (13)° between the two three‐atom planes.     

Reaction of (S)-homoserine lactone with Grignard reagents: synthesis of amino-keto-alcohols and β-amino acid derivatives

The ring-opening reaction of homoserine lactone with phenylmagnesium bromides was systematically examined. A reliable method to achieve β-amino acid precursors was developed by tuning the reaction conditions to favor mono-addition to the carbonyl moiety of the lactone.     

A New Approach to the Lenard–Magri Scheme of Integrability

We develop a new approach to the Lenard–Magri scheme of integrability of bi-Hamiltonian PDEs, when one of the Poisson structures is a strongly skew-adjoint differential operator.     

Radioactivity levels in some wild edible mushroom species in Turkey

Eleven different wild-growing edible mushroom species collected from various regions of Turkey were analysed for their content of 137Cs, 40K, 226Ra and 232Th using a high-resolution gamma-ray spectrometry. Specific activities of 226Ra and 232Th were generally below detection limits. The specific activities of 137Cs and 40K ranged from 2.4+/-0.3 to 109.0+/-7.3 Bq kg-1 with a mean of 28.4+/-27.2 Bq kg-1 (dry matter) and 715.5+/-50.1 to 1779.0+/-163.7 Bq kg-1 with a mean of 1150.8+/-315.2 Bq kg-1 (dry matter), respectively. The mean annual effective dose of 137Cs and 40K through mushrooms were estimated to be (7.0+/-6.0)x10(-3) microSv and 0.13+/-0.03 microSv, respectively. The overall intake of 137Cs is quite low and no significant contamination was found in collected mushroom species. The highest contents of 137Cs and 40K among the analysed mushrooms were in Morchella esculenta and Stropharia coronilla, respectively.     

Synthesis,Crystal Structure,Spectroscopic and Electronic Properties of (E)-Trans-2-(2-(Biphenyl-4-ylmethylene)Hydrazinyl)-4-(3-Methyl-3-Phenylcyclobutyl)Thiazole

Abstract  

A new compound of (C₂₇H₂₅N₃S) has been synthesized and characterized by ¹H NMR, ¹³C NMR, IR, UV-Visible spectroscopy, and single crystal X-ray diffraction. The compound crystallizes in the monoclinic space group P2₁/c and crystals of (I) were found approximately 0.5:0.5 ratio to be twinned. The crystal structure is stabilized by N–H···N inter molecular hydrogen bonding. In addition to the molecular geometry and dimeric structure from X-ray experiment, the optimized molecular geometry for monomer and dimer, vibrational frequencies, atomic charges distribution, and total energies of the title compound in the ground state have been calculated using ab initio method. Density Functional Theory (B3LYP) and Hartree-Fock (HF) methods with basis sets 6-31G(d, p) and 3-21G were used in the calculations. Calculated frequencies are in good agreement with the corresponding experimental data. UV-Vis absorption spectra of the compound have been ascribed to their corresponding molecular structure and electrons orbital transitions.     

The propagation of discontinuities in non-homogeneous thermoviscoelastic media

In this study, the propagation of plane, cylindrical and spherical dilatational waves in non-homogeneous thermoviscoelastic media is investigated by employing the notion of singular surfaces and the method of characteristics. The inhomogeneity of the medium is such that the material properties depend in an arbitrary manner on the co-ordinate coinciding with the direction of the propagation. An integral type constitutive equation is considered for the heat flux which permits a finite propagation speed for thermal disturbances. It is found that the application of a dynamic input on the boundary surface gives rise to two different wave fronts along which mechanical and thermal effects are coupled. The growth and decay equations describing the change of the strength of the discontinuities on these two wave fronts are then obtained. By integrating the growth and decay equations along the rays the solutions valid at the wave fronts are found. The solutions are then reduced to two special cases: in one the heat flux equation is taken as the so-called modified Fourier equation, and in the other as the classical Fourier equation. The effects of inhomogeneity, geometry of the wave front, thermomechanical coupling and material internal friction on the strength of the discontinuity are discussed.     

Preparation and Characterization of Hexakis[2-methoxy-4-(2,3-dimethylphenylimino)phenylato]cyclotriphosphazene

Hexakis[2-methoxy-4-(2,3-dimethylphenylimino)phenylato]cyclotriphosphazene was prepared by the reaction of hexakis[2-methoxy-4-formylphenoxy]cyclotriphosphazene and 3,4-dimethylaniline. The structure of new cyclotriphosphazene derivative was determined by elemental analysis, IR, ¹H NMR, ¹³C NMR spectra, thermal analysis, and X-ray diffraction.

Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file.     

N1‐(4‐tert‐Butyl­phenyl)‐N2‐hydroxy‐α‐oxo‐α‐phenyl­acet­amidine and N2‐hydroxy‐N1‐(4‐nitro­phenyl)‐α‐oxo‐α‐phenyl­acet­amidine hemihydrate

In the title compounds, C₁₈H₂₀N₂O₂, (I), and C₁₄H₁₁N₃O₄·0.5H₂O, (II), respectively, the oxime groups have an E configuration. In (I), the mol­ecules exist as polymers bound by intermolecular C—H⋯O and O—H⋯N hydrogen bonds around inversion centres. In (II), intermolecular OW—H⋯N, OW—H⋯O and O—H⋯OW interactions stabilize the molecular packing.