Dipyridine copper

Dipyridine diazido-metal complexes 5 D1502 dipyridine cadmium (II) diazides 5 DIS02 dipyridine copper (II) diazide 5 D1502 dipyridine nickel (II) diazide 5 DI S02 dipyridine zinc (II) diazide 5 D1S02... 

Rajitha, B., Naveen Kumar, V., Someshwar, R, Venu Madhav, J., Narsimha Reddy, P., Thirupathi Reddy, Y. 2006. Dipyridine copper chloride catalyzed coumarin synthesis via Pechmann condensation under conventional heating and microwave irradiation. ARX/VOC 2006(12) 23-27. 

Figure 12.16 TG and DTG curves of (a) salicylaldehyde-o-aminobenzoic acid nickel(II) monohydrate, (b) salicylalde-hyde-o-aminobenzoic acid copper (II) monoacetate, (c) N-salicylaldehyde-o-aminobenzoic acid dipyridine copper(II) monohydratc and (d) o-vanillin-o-aminobenzoic acid copper(II) monohydrate [5-7 ...

Five-hundredths mole of a manganese(II), iron(II),t cobalt(II), nickel(II), copper(II), or zinc(II) salt is dissolved in 300 ml. of distilled water containing 20 ml. of pyridine. To this solution is added slowly with stirring a solution of 8.00 g. of ammonium thiocyanate in 100 ml. of distilled water, and the resulting mixture is allowed to stand in an ice bath until precipitation appears complete (ca. an hour). The precipitate is collected on an 8-cm. Buchner funnel and is washed with three 10-ml. portions of an ethanol-pyridine (9 1) solution. The product is air-dried for not longer than 10 minutes. It is powdered and then dried in a desiccator over potassium hydroxide until constant weight has been attained (ca. 24 hours). In the cases of copper(II) and zinc(II), the dipyridine compound is obtained. Details of separate syntheses are given in Table I. 

An analogous system involved the condensation of pentane-2,4-dione (127) with 6,6 -6w(jV-methylhydrazino)-2,2 -dipyridine (126) in the presence of nickel(II) to generate the thirteen-membered complex 128. Treatment of the complex with sodium cyanide does not release the ligand, nor does the complex form when copper is used as the metal template U0). 

See also Bis(4-imino-2-pentanonato)copper(II) and bis(3-phenyl-imino-l-phenyl-l-butanonato)copper(II), synthesis 1 Complex carbonates of beryllium, synthesis 2 Dichloro(2,2 -iminodipyridine)zinc, diacetato(2,2 -imino-dipyridine)zinc, and dicyano(2,2 -iminodipyridine)zinc, synthesis 3... 

PET membranes (Poretics, polyester, pore size 0.2 pm, membrane thickness 10 pm) were purchased from Osmonics, Inc. Diethylether (99%), 2,2 -azobisisobutyronitrile (AIBN), copper (1) bromide (CuBr) (98%), acetone (min. 99.5%), methanol (99%), ethanol (99%), methyl ethyl ketone (MEK) (99%) and polyethylenimine (hygroscopic) were purchased fiom VWR International and used as received. 4,4-Dinonyl-2,2-dipyridine (DNBP) (97%) and ethyl-2-bromoisobutyrate (98%) were purchased from Sigma-Aldrich. Tetrahydrofiiran (THF) was supplied by the Eh Co. Poly(acrylic acid) (PAA) (25% aqueous solution) and 2,3,4,5,6-pentafluorostyrene (PFS) were obtained from Polyscience Inc. and Oakwood Products Inc., respectively. Glycidyl methacrylate (min 95%) was purchased from TCI, America. 

Non-specific visualization procedures (e.g., charring) for tocopherols/tocotrienols are based on spraying with sulfuric acid, perchloric acid, nitric acid, or copper (II) sulfate phosphoric acid (54). More specific though still subject to many interferences are reactions which take advantage of the reducing properties of vitamin E derivatives. In the Emmerie-Engel reaction and its later modifications, ferric ions are reduced to ferrous ions, which form a red-colored complex with a,a -dipyridine ot bathophenanthroline (50,51). A comparable sensitivity is achieved by spraying with phospho-molybdic acid. The color can be stabilized by subsequent exposure of the plates to ammoniacal 2,7-dichlorofluorescein (51). 

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