The Synthesis, Structural Characterization and Conformational Analysis of (1,3-Bis(2-methyl-4-diethylaminophenyl)imidazolidin-2-ylidene)chloro(1, 5-cyclooctadiene)rhodium(I)

A four-coordinated Rh(I) complex with a new heterocyclic carbene ligand, functionalized by amino donor pendants, 4, was synthesized and characterized by elemental analyses, NMR and IR spectroscopy, and the molecular structure of the title compound has been determined by X-ray crystallography. Crystallographic data: monoclinic, P21/m, a = 7.9307(5), b = 25.0061(12), c = 8.0780(6) Å, ß = 101.366(6)°, V = 1570.58(17) Å3, ?calc = 1.3515(1) g cm-3, Z = 2. The experimentally obtained structural parameters for compound 4 compare reasonably well with those calculated at the semi-empirical ZINDO/1 level of theory carried out to elucidate conformational flexibility and steric hindrances. © 2005 Verlag der Zeitschrift für Naturforschung

Synthesis and structural characterization of trans-bis[1,3-bis(methoxy- ethyl)-4,5-bis(2,4,6-trimethylphenyl)imidazolidin-2-ylidene]dichloro- palladium(II)

A Pd(II) complex of a new N-heterocyclic carbene (NHC) ligand with bulky substituents and functionalized methoxy-donor side arms has been synthesized and characterized by elemental analyses, 1H and 13C NMR, and IR spectroscopy. Molecular and crystal structures of the title complex have been determined by single crystal X-ray diffraction. The compound crystallizes in the monoclinic space group P21/c, with a = 15.927(2), b = 8.489(2), c = 20.309(5) Å, ß = 99.213(2)°, Z = 2, Dx = 1.253 g cm-3. The palladium atom is situated on an inversion center. There are several weak intramolecular C-H?N/O interactions. © 2007 Verlag der Zeitschrift für Naturforschung.Ministerio de Ciencia y Tecnología, MICYT: MAT2006-01997 Dokuz Eylül ÜniversitesiThis work was financially supported by the Dokuz Eylül University Research Fund (Project No: 04.KB.FEN.100). Also, financial support from the Spanish Ministerio de Edu-cacion y Ciencia (MAT2006-01997 and ’Factoría de Cristal-ización’ Consolider Ingenio 2010) is acknowledged. -

The synthesis, electrochemical properties and structural characterization of bis (N-(4-dimethylaminophenyl)-3,5-di-tert-butylsalicylaldiminato)copper(II)

A Cu(II) complex of a Schiff base obtained by the condensation of N,N-dimethyl-1,4-phenylenediamine with 3,5-di-tert-butyl-2-hydroxybenzaldehyde has been synthesized and characterized. The structure of the complex was determined by single-crystal X-ray methods. The four-coordinate Cu(II) ion possesses a compressed tetrahedral coordination environment. © 2006 Taylor & Francis.Dokuz Eylül ÜniversitesiThis work was supported by the Dokuz Eylül University Research Fund (project number 04.KB.FEN.100). Hasan Karab|y|k would like to thank TÜBITAK_ (The Scientific and Technical Research Council of Turkey) for partial financial support. -

The properties of various igneous rocks for gamma-ray shielding

The photon linear attenuation coefficients (mu) have been calculated for four different igneous rocks which are widely used in industrial field using XCOM computer code and the results were compared with measured values. The relation between linear attenuation coefficients and some of the physical and mechanical properties of rocks has also been investigated by linear regression analysis. It has been found that with increasing linear attenuation coefficient, density, uniaxial compressive strength, bending strength, shore hardness and SiO2 percentage have also increased, however the other properties such as abrasion strength and porosity have decreased. (c) 2006 Elsevier Ltd. All rights reserved

Chemical composition and bioactivity of essential oils and Ethanolic extracts of Ocimum basilicum L. and Thymus algeriensis Boiss. & Reut. from the Algerian Saharan Atlas.

BACKGROUND: There is increasing interest in the pharmaceutical and food industries to substitute synthetic chemicals with naturally occurring compounds possessing bioactive properties. Plants are valuable sources of bioactive compounds. The present study investigates the chemical composition and antioxidant, antimicrobial, and anticancer activities of ethanolic extracts (EEs) and essential oils (EOs) from two species in the Lamiaceae family, Ocimum basilicum L. and Thymus algeriensis Boiss. & Reut., cultivated in the Algerian Saharan Atlas. METHODS: The total flavonoid contents of the plants' ethanolic extracts were determined by the aluminium chloride method, while the total phenols were determined using the Folin-Ciocalteu method. Essential oils were obtained by hydrodistillation of the aerial parts of the plants and were analysed by GC-MS. The free radical-scavenging ability and antioxidant potential of the plants' EEs and EOs were probed using the 2, 2-diphenyl-picrylhydrazyl radical-scavenging, ABTS radical-scavenging, ferric-reducing power and phosphomolybdenum assays. The antimicrobial activities were evaluated against several pathogens characteristic of gram-negative bacteria (three species), gram-positive bacteria (three species) and fungi (two species). The microdilution method was used to estimate the minimum inhibitory concentrations (MICs). The oils' anticancer potential against several cancer types was also studied using the MTT assay and reported as the toxic doses that resulted in a 50% reduction in cancer cell growth (LD(50)). RESULTS: Phenolic compounds in the EEs from both plants were analysed by HPLC and demonstrated a rich flavonoid content. Chemical analysis of the essential oil from Ocimum basilicum revealed 26 unique compounds, with linalool (52.1%) and linalyl acetate (19.1%) as the major compounds. A total of 29 compounds were identified in the essential oil from Thymus algeriensis, with α-terpinyl acetate (47.4%), neryl acetate (9.6%), and α-pinene (6.8%) as the major compounds. The ethanolic extracts and essential oils from both plants exhibited moderate antioxidant activities and moderate to weak antimicrobial activities. Furthermore, anticancer activities against the examined human cancer cell lines were associated with only the EOs from both plants, with LD(50) values ranging between 300 and 1000 μg/mL. CONCLUSION: The results suggest that the bioactive compounds found in the ethanolic extracts and essential oils from Ocimum basilicum and Thymus algeriensis, with diverse antioxidant, antimicrobial and anticancer activities, may have beneficial applications in nutraceutical and pharmaceutical technologies