Spectroscopic and X-Ray Crystallographic Studies of Pentameric Ethyl Cyclopolyphosphine Derivatives of Triosmium Carbonyl Clusters

The syntheses of new BEDT-TTF derivatives are described. These comprise BEDT-TTF with one ethynyl group (HC≡C-), with two (n-heptyl) or four (n-butyl) alkyl side chains, with two trans acetal (-CH(OMe)2) groups, with two trans aminomethyl (-CH2NH2) groups, and with an iminodiacetate (-CH2N(CH2CO2−)2 side chain. Three transition metal salts have been prepared from the latter donor, and their magnetic properties are reported. Three tris-donor systems are reported bearing three BEDT-TTF derivatives with ester links to a core derived from benzene-1,3,5-tricarboxylic acid. The stereochemistry and molecular structure of the donors are discussed. X-ray crystal structures of two BEDT-TTF donors are reported: one with two CH(OMe)2 groups and with one a -CH2N(CH2CO2Me)2 side chain.

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Supported ammonia synthesis catalysts based on potassium derivatives of anionic ruthenium, osmium and iron carbonyl clusters. The first catalysts on carbon support exhibiting activity in ammonia synthesis in the absence of a specially added electron promoter

Journal of Molecular Catalysis A Chemical ◽

10.1016/s1381-1169(98)00198-8 ◽

1999 ◽

Vol 139 (2-3) ◽

pp. 219-225 ◽

Cited By ~ 18

Author(s):

S Yunusov

Keyword(s):

Ammonia Synthesis ◽

Carbon Support ◽

Iron Carbonyl ◽

Carbonyl Clusters ◽

Synthesis Catalysts ◽

Derivatives Of

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The Through-Bond Interaction of a Sulfur Lone Pair with Oxygenated Substituents in the Thiacyclohexane Framework

Australian Journal of Chemistry ◽

10.1071/ch05073 ◽

2005 ◽

Vol 58 (7) ◽

pp. 531

Author(s):

Laura Andrau ◽

Jonathan M. White

Keyword(s):

Low Temperature ◽

Crystal Structures ◽

Bond Distance ◽

Lone Pair ◽

X Ray ◽

Ester Derivative ◽

Bond Interaction ◽

Derivatives Of ◽

Electron Demand

Low-temperature X-ray crystal structures were determined on a range of derivatives of 4-thiacyclohexanol 5a of varying electron demand with a view to finding evidence for a through-bond interaction between the sulfur lone pair and the oxygenated substituent. In contrast to earlier suggestions, plots of C–OR bond distance versus pKa (ROH) showed that any interaction between the sulfur and the OR group is unlikely to be of a through-bond origin. Furthermore, unimolecular solvolysis rate measurements on the nosylate ester derivative 5g showed that the sulfur actually retards the reaction slightly in comparison with the corresponding sulfur-free analogue 6.

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Di-n-butyltin(IV) derivatives of bis(carboxymethyl)benzylamines: synthesis, NMR and X-ray structure characterization andin vitro antitumour properties

Applied Organometallic Chemistry ◽

10.1002/aoc.205 ◽

2001 ◽

Vol 15 (7) ◽

pp. 593-603 ◽

Cited By ~ 23

Author(s):

Teresa Mancilla ◽

Lourdes Carrillo ◽

Luis S. Zamudio Rivera ◽

Carlos Camacho Camacho ◽

Dick de Vos ◽

...

Keyword(s):

Structure Characterization ◽

X Ray ◽

Derivatives Of

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The direct electrochemical synthesis of some metal derivatives of lapachol

Canadian Journal of Chemistry ◽

10.1139/v97-058 ◽

1997 ◽

Vol 75 (5) ◽

pp. 499-506 ◽

Cited By ~ 15

Author(s):

E.H. De Oliveira ◽

G.E.A. Medeiros ◽

C. Peppe ◽

Martyn A. Brown ◽

Dennis G. Tuck

Keyword(s):

Electrochemical Oxidation ◽

Copper Atom ◽

Electrochemical Synthesis ◽

Acetonitrile Solution ◽

Triclinic Space Group ◽

X Ray ◽

Metal Anode ◽

X Ray Crystallography ◽

Metal Derivatives ◽

Derivatives Of

The electrochemical oxidation of a sacrificial metal anode (M = Zn, Cd, Cu) in an acetonitrile solution of 2-hydroxy-3-(3-methyl-2-butenyl)-1,4-naphthoquinone, lapachol, C15H14O3 (=HL) gives ML2. The results are in keeping with earlier work on direct electrochemical synthesis in related systems. Adducts with 2,2′-bipyridine (bpy) and N,N,N′,N′-tetramethylethanediamine (tmen) have also been prepared. The structure of the 2,2′-bipyridine adduct of Cu(lapacholate)2 has been established by X-ray crystallography. The parameters are triclinic, space group [Formula: see text], a = 12.748(59) Å, b = 13.859(49) Å, c = 11.770(59) Å, α = 108.30(4)°, β = 108.08(3)°, γ = 68.94(3)°, Z = 2, R = 0.059 for 2256 unique reflections. The copper atom is in a distorted CuN2O2O2′ environment. The mechanism of the formation of this Cu(lapacholate)2 is discussed. Keywords: electrochemical synthesis, lapachol, X-ray crystallography, copper(II) complex.

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