Die Bildung von Fluorisocyanat (F—NCO) in Argonmatrix

Matrix samples of F-CO-N3, and X-CO-NF2 (X = H, NF2, CF3) were photolyzed by mercury arc light and the new infrared bands at 2172, 861, 695, 646, 529 cm-1 assigned to the F-NCO molecule. 15N isotopic substitution confirmed the assignment of the IR bands of the new compound

Poly[{μ10-[(phosphono­meth­yl)imino­dimethyl­ene]diphospho­nato}dithallium(I)]

The title compound, [Tl2(C3H10NO9P3)]n, a TlI organic–inorganic hybrid complex, was synthesized by the reaction of nitrilo­tris(methyl­enephospho­nic acid) with thallium(I) nitrate. There are two types of Tl+ ions in the complex, with coordination numbers of eight and seven and with stereochemically active and inactive lone-pair electrons, respectively. In the crystal, the doubly deprotonated ligands form two-dimensional hydrogen-bonded layers through O—H⋯O hydrogen bonds. The NH group is involved in a trifurcated intra­molecular hydrogen bond. Coordination of the phospho­nate ligands to the Tl+ ions creates a three-dimensional structure

Total phenols, flavonoids, anthocyanins, ascorbic acid contents and antioxidant activity of Rhamnus kurdica Boiss for flower and leaves in flowering and pre-flowering stages

The antioxidant capability, total phenol, total flavonoid, anthocyanins, ascorbic acid contents, and reducing power contents of polar and non-polar extracts for flower and leaves in two stages of growth for Rhamnus kurdica Boiss in flowering were evaluated in this work. The polar extraction of flower of R. kurdica Boiss had a higher total phenolic content as well as antioxidant activity compared to that of the other subfractions of flower and leaves in the different stages. Antioxidant activities of the samples were determined by three various testing systems namely 2, 2-diphenyl-1-picrylhydrazyl (DPPH),  b-carotene/linoleic acid and reducing power assay. In DPPH system, the highest radical scavenging activity was seen by the polar subfraction in flowers of methanol extract [21.04±1.35 (μg/ml)]. Our findings demonstrate that the methanolic extracts of R. kurdica Boiss may be suggested as a new potential source of natural antioxidant.Keywords: Rhamnus kurdica Boiss, antioxidant, total phenolics, flaAfrican Journal of Biotechnology, Vol. 13(10), pp. 1131-1135, 5 March, 201

Cloud Point Extraction and Spectrophotometric Determination of Uranium (VI) in Water Samples after Mixed Micelle-Mediated Extraction Using Chromotrope 2R as Complexing Agent

A rapid, selective and sensitive method for the preconcentration and determination of uranium (VI) by cloud point extraction (CPE) was developed. The method was based on the color reaction of 5.00 ng mL−1 uranium (VI) with 1.5×10−4 mol L−1 of chromotrope 2R in the presence of 0.015 mol L−1 potassi-um iodide at pH 8 in HEPES buffer and mixed micelle-mediated extraction of complex. The mixture of a nonionic surfactant (0.2 % (v/v) of (Triton X-114) and a cationic (2.0×10−4 mol L−1 of CTAB) was utilized as a suitable micellar medium for preconcentration and extraction of uranium (VI) complexes. Effect of extraction and reaction parameters was studied and optimum parameters were established. The analytical characteristics of the method (e.g. linear range, limit of detection, preconcentration and improvement factors) were obtained. Linearity was obeyed in the range of 0.2−10 ng mL−1 of uranium (VI) with a detection limit of 0.035 ng mL−1. The diverse ion effect of some anions and cations on the extraction efficiency of target ions was tested. The proposed method was successfully applied for the determination of uranium (VI) in various water samples. (doi: 10.5562/cca1922

Synthesis & Spectral Characterization of Some New Carbacylamidophosphate Derivatives. Crystal Structures of CCl3C(O)NHP(O)[NH(C5H9)]2 and CH3C6H4C(O)NHP(O)[NH(C5H9)]2

Full Title: Synthesis and Spectral Characterization of Some New Carbacylamidophosphate Derivatives. Crystal Structures of CCl3C(O)NHP(O)[NH(C5H9)]2 and CH3C6H4C(O)NHP(O)[NH(C5H9)]2Some new carbacylamidophosphate derivatives with the general formula RC(O)NHP(O)[NH(C5H9)]2: (R=CCl3), 1a; (R=CHCl2), 2a; (R=CH2Cl), 3a; (R=CF3), 4a; (R=C6H5), 1b; (R=p-Cl-C6H4), 2b; (R=p-Br-C6H4), 3b; (R=p-Me-C6H4), 4b; were synthesized and characterized by 1H, 13C, 31PNMRand IR spectroscopy and elemental analysis. The crystalline solids of 1a and 4b were studied bysingle crystal X-ray diffraction analysis. The dimeric aggregate and the centrosymmetric dimer formed via intermolecular N-H....O=P and N-H....O=C hydrogen bonds in 1a and 4b, respectively. In all the synthesized molecules, similar spectral patterns were obtained in the 13C NMR spectra for carbon atoms of cyclic amines with 2J PNC = 0 and 3JPNC ranging from 4 to 6 Hz.KEYWORDS: Carbacylamidophosphates, hydrogen bonds, IR spectroscopy, NMR spectroscopy

Investigation of structure-directing interactions within copper(i)thiocyanate complexes through X-ray analyses and non-covalent interaction (NCI) theoretical approach

Herein, we reported the synthesis of copperIJI) thiocyanate complexes with ortho-pyridinyl carbohydrazones containing a thiophene (L1) or a furyl ring (L2) as a mixture of two different crystals for each compound, linkage isomers of C1N, [CuIJNCS)IJL1)PPh3] and C1S, [Cu(SCN)(L1)PPh3], for L1, whereas monomeric and polymeric structures C2N, [Cu(NCS)(L2)PPh3], and C2P, [–(NCS)Cu(L2)–]n, for L2. Crystallographic information and theoretical calculations, mainly noncovalent interaction reduced density gradient (NCI-RDG) analyses, were pursued to generate a profound understanding of the structure-directing interactions in these complexes. The supramolecular assemblies are first driven by cooperative π⋯π interactions and hydrogen bonds followed by CH⋯π, S⋯S and S⋯π linkages. In the case of the linkage isomers, intermolecular interactions may have a significant role in the formation of the less stable S-bound isomer C1S

4-(N-Propan-2-ylcarbamo­yl)pyridinium perchlorate

In the title compound, C9H13N2O+·ClO4 −, the dihedral angle between the planes of the amide group and the pyridinium fragment is 34.11 (14)°. In the crystal, the cations are connected by N—H⋯O hydrogen bonds between the amide groups into chains extended along the a axis. Hydrogen bonds between the pyridinium N—H group and the perchlorate anions organize the chains into a two-dimensional network

N-[Bis(dimethyl­amino)phosphinoyl]-2,2,2-trichloro­acetamide

In the title compound, C6H13Cl3N3O2P or CCl3C(O)NHP(O)(N(CH3)2), the phosphinoyl group is synclinal to the carbonyl group and acts as an acceptor for an inter­molecular N—H⋯O hydrogen bond from the amide group as the donor

N,N′-Di-tert-butyl-N′′-(2,6-difluoro­benzo­yl)phospho­ric triamide

In the title compound, C15H24F2N3O2P, the phosphoryl and carbonyl groups adopt anti positions relative to each other. The P atom is in a tetra­hedral coordination environment and the environment of each N atom is essentially planar. In the crystal, adjacent mol­ecules are linked via N—H⋯O=P and N—H⋯O=C hydrogen bonds into an extended chain parallel to the a axis. The crystal studied was a non-merohedral twin with a minor twin component of 36.4 (1)%