Dimethylplatinum(IV) chemistry: Stannyl, hydride, hydroxide, and aqua complexes

2003 ◽  
Vol 81 (6) ◽  
pp. 476-483 ◽  
Author(s):  
Ernest M Prokopchuk ◽  
Richard J Puddephatt
Keyword(s):  
Hydrogen Bonding ◽  
Key Words ◽  
Hydroxo Complex ◽  
Aqua Complex ◽  
Thermally Stable ◽  
Moist Air ◽  
Aqua Complexes

The dimethylplatinum(II) complex [PtMe2(Me3TACN)] (Me3TACN = 1,4,7-trimethyl-1,4,7-triazacyclononane) reacts easily with Me3SnCl, Me2SnCl2, or HX (X = CF3CO2, CF3SO3, BF4) to give the thermally stable cationic dimethyl platinum(IV) complexes [Pt(SnMe3)Me2(Me3TACN)]+, [Pt(SnMe2Cl)Me2(Me3TACN)]+, or [PtHMe2(Me3TACN)]+. The complexes [PtMe2(Me3TACN)] and [PtHMe2(Me3TACN)]+ are oxidized by moist air to give the hydroxo complex [PtMe2(OH)(Me3TACN)]+, which can then be protonated reversibly to form the aqua complex [PtMe2(OH2) (Me3TACN)]2+. The structures of the hydroxo complex [PtMe2(OH)(Me3TACN)]+, as both the BF[Formula: see text] or CF3SO[Formula: see text] salt, and of the mixed hydroxo, aqua complex [PtMe2(OH)(Me3TACN)][PtMe2(OH2)(Me3TACN)][BF4]3 have been determined and the complexes are shown to display interesting hydrogen bonding. Key words: platinum, oxidation, organometallic, tin, hydride.

Solvatochromic Fluorescence of 8-(Phenylamino)-1-naphthalene-ammoniumsulfonate (8,1 ANS) in 1,4-Dioxane/Water Mixtures, revisited

1993 ◽  
Vol 48 (5-6) ◽  
pp. 709-712 ◽  
Author(s):  
Stefan H. Hüttenhain ◽  
Wolfgang Balzer
Keyword(s):  
Hydrogen Bonding ◽  
Key Words ◽  
Fluorescence Intensity ◽  
Stokes Shift ◽  
Solvent Mixture ◽  
Fluorescence Properties ◽  
Correlation Line ◽  
Polarity Parameters

Abstract The correlation of the solvatochromic fluorescence properties of 8-(phenylamino)-1-naphthalene-ammoniumsulfonate (8,1 ANS) in 1,4-dioxane/water mixtures with Eτ(30) and Δƒ values of the respective solvents shows that besides the polarity the nature of the solvent mixture determines the fluorescence intensity I and the Stokes shift Δv̅. Different amounts of hydrogen-bonding are suggested to be responsible for the different slopes of the correlation line plots. Key words: Solvatochromic fluorescence 8-(phenylamino)-1-naphthalene-ammoniumsulfonate (8,1 ANS); Semi-empiric polarity parameters 1,4-dioxane/water mixtures.

The direct electrochemical synthesis of the novel copper(I) complex Cu2[OC6Cl4(OH)]2[(C6H5)2PCH2P(C6H5)2]2

1991 ◽  
Vol 69 (2) ◽  
pp. 251-256 ◽  
Author(s):  
Theodore A. Annan ◽  
James E. Kickham ◽  
Dennis G. Tuck
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Key Words ◽  
Electrochemical Synthesis ◽  
Acetonitrile Solution ◽  
The Novel ◽  
Anionic Ligand ◽  
Platinum Cathode ◽  
Aromatic Diol ◽  
Novel Complex

The electrochemical oxidation of copper in an acetonitrile solution of an aromatic diol (R(OH)2 = catechol, tetrachloro-1,2-dihydroxybenzene, 2,2'-dihydroxybiphenyl) gives soluble copper(I) products which are reduced to copper at a platinum cathode. In the presence of R(OH)2 + L (L = 2,2'-bipyridine, triphenylphosphine, bis(diphenylphosphino)methane (= dppm)), the products are adducts of copper(I) species in which the anionic ligand is [R(O)OH]−. The crystal structure of Cu2[OC6Cl4(OH)]2(dppm)2 is triclinic, with a = 22.418(5) Ǻ b = 1.784(4) Ǻ, c = 13.492(4) Ǻ, α = 61.63(2)°, β = 86.66(2)°, γ = 80.61(2), V = 3093(2) Ǻ3, Z = 2, and space group [Formula: see text] The molecule consists of a Cu—P—C—P—Cu—P—C—P ring, with copper ligated by [R(O)OH]− groups external to this. Intramolecular O—H—O hydrogen-bonding contributes to the stabilization of this novel complex. Key words: Copper, electrochemical synthesis, hydrogen bonding, aromatic diols, crystal structure.

Naphthalene diimide-incorporated helical thienoacene: a helical molecule with high electron mobility, good solubility, and thermally stable solid phase

2020 ◽  
Vol 56 (82) ◽  
pp. 12343-12346
Author(s):  
Nobuhiko Ohtsuka ◽  
Masahiro Nakano ◽  
Sae Nakagawa ◽  
Md. Shahiduzzaman ◽  
Makoto Karakawa ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Electron Mobility ◽  
Solid Phase ◽  
High Electron ◽  
Two Dimensional ◽  
Thermally Stable ◽  
High Electron Mobility ◽  
Good Solubility ◽  
Naphthalene Diimide

A Naphthalene diimide (NDI)-incorporated helical thienoacene was developed. The compound has high electron mobility (1.4 cm2 V−1 s−1) thanks to its two-dimensional π–π interaction assisted by the intermolecular C–H⋯O hydrogen bonding of the NDI moieties.

scholarly journals Studies on the Tanning with Glutaraldehyde as an Alternative to Traditional Chrome Tanning System for the Production of Chrome Free Leather

1970 ◽  
Vol 43 (4) ◽  
pp. 553-558 ◽  
Author(s):  
Dipankar Chakraborty ◽  
Ariful Hai Quadery ◽  
M Abul Kashem Azad
Keyword(s):  
Thermal Stability ◽  
Key Words ◽  
High Performance ◽  
Viable Alternative ◽  
Cross Linking ◽  
Thermally Stable ◽  
Chrome Tanning ◽  
Tanning Process

Chrome tanning is a versatile tanning system, but the pollution problems of chromium due to inadequacy of treatment systems and possible formation of Cr(VI), a carcinogen, have led to search for an ecofriendly and viable alternative tanning system. The present investigation focuses on the development of a novel, high performance and thermally stable aldehyde tannage system to produce chrome free leather by cross linking the NH2 groups of collagen with glutaraldehyde (CHO-CH2-CH2-CH2-CHO). After as usual soaking, liming, deliming, bating and pickling operations the pickle pelts were tanned with glutaraldehyde and other syntans. This developed chrome free tanning process produce crust leathers exhibiting thermal stability >85°C and reducing the TDS value with 0% emission of Cr-salt in tannery discharge. Key words: Eco friendly tanning system, Chrome free leather, Crust leathers   doi: 10.3329/bjsir.v43i4.2246   Bangladesh J. Sci. Ind. Res. 43(4), 553-558, 2008

scholarly journals Photodegradation of Orange Green by Fe(III)–Aqua Complex

2012 ◽  
Vol 60 (1) ◽  
pp. 43-46 ◽  
Author(s):  
Md Mufazzal Hossain ◽  
Md Rashedul Islam Rasel ◽  
Md Safiqul Islam
Keyword(s):  
Uv Light ◽  
Solar Light ◽  
Aqua Complex ◽  
Average Intensity ◽  
Light Illumination ◽  
Light Sources ◽  
Initial Concentration ◽  
Aqua Complexes

The photodegradation of orange green (OG) by excitation of Fe (III)-aqua complexes has been investigated under UV and solar light illumination. The rate of degradation has been found to be strongly influenced by the pH of the solution, initial concentration of Fe(III) and the nature of the light sources. The progress of removal of OG from solution has been monitored by recording the change of absorbance at ?max = 480 nm, (? = 1.27 × 104 L mol-1cm-1 at 30°C), with time. The pH has been varied from 1.2 to 3.5. The initial concentration of Fe (III) was between 9.0 × 10-4 mol L-1 and 2.4 × 10-3 mol L-1. The intensity of the UV artificial source was 14 Wm-2, whereas the average intensity of the solar light during the experiments was about 700 Wm-2. An optimistic result was obtained, when OG was irradiated by solar light. About 92% degradation of 1.5 × 104 mol L-1 OG solution has been done within 70 minutes by photodegradation using Fe(III)-aqua complex at pH 2.5 by UV light whereas about 86% degradation has been recorded by the solar light under the same conditions.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10334  Dhaka Univ. J. Sci. 60(1): 43-46 2012 (January)

scholarly journals Copper(II) ions mediated crystal formation of 3-(3-hydroxy phenyl)-1-phenyl-1h-pyrazole- 4-carbaldehyde

2021 ◽  
Vol 34 (3) ◽  
pp. 589-596
Author(s):  
A. R. Banpurkar ◽  
S. S. Wazalwar ◽  
F. Perdih
Keyword(s):  
Hydrogen Bonding ◽  
Schiff Base ◽  
Crystal Growth ◽  
Key Words ◽  
Copper Ions ◽  
Spectroscopic Characterization ◽  
Water Molecules ◽  
Crystal Formation ◽  
Stacking Interactions ◽  
X Ray

Schiff base obtained from 3-hydroxyacetophenone and phenylhydrazine was subjected to Vilsmeier-Haack reaction to obtain 3-(3-hydroxyphenyl)-1-phenyl-1H-pyrazole-4-carbaldehyde (2). Successful formation of crystals of 2 was achieved using copper ions (Cu2+) as template. Present paper reports study of spectroscopic characterization and single-crystal X-ray study of 2. Hydrogen bonding network between 2 and water molecules enable the formation of 2D layer along ab-plane supported also by π···π stacking interactions of parallel molecules in head-to-head fashion.                     KEY WORDS: Cu2+ assisted crystal growth, Pyrazole-4-carbaldehyde, X-ray crystal study, Hydrogen bonding study   Bull. Chem. Soc. Ethiop. 2020, 34(3), 589-596. DOI: https://dx.doi.org/10.4314/bcse.v34i3.13

Catalysis by β-cyclodextrin in the reaction of p-nitrophenyl acetate with α-amino acids

1991 ◽  
Vol 69 (7) ◽  
pp. 1124-1130 ◽  
Author(s):  
Mónica Barra ◽  
Rita H. De Rossi
Keyword(s):  
Amino Acids ◽  
Hydrogen Bonding ◽  
Amino Acid ◽  
Key Words ◽  
Methyl Esters ◽  
Chiral Discrimination ◽  
Ester Aminolysis

The reactions of p-nitrophenyl acetate, 1, with both enantiomers of the following α-amino acids: alanine (2a), methionine (2b), leucine (2c), and tryptophan (2d), were studied in the presence of p-cyclodextrin (β-CD). All the reactions were catalyzed by β-CD and no chiral discrimination was observed. The reactions of 1 with the D isomers of 2a and 2d were also studied in the presence of α- and γ-CD. In both cases the catalysis increased in the order α < γ < β-CD. Also, to analyze the influence of the polar nature of the nucleophile, the reactions of 1 with both enantiomers of the methyl esters of 2a, 2c, and 2d were studied in the presence of β-CD. The catalysis observed was significantly smaller than that for the reactions with the amino acids. It is suggested that the catalysis by CDs is due to the formation of a ternary hydrogen-bonding complex that results from the association of the amino acid with the complexed substrate. The effect of the size of the CD cavity on the observed catalysis is attributed to the geometrical requirements for the reaction. The decrease in catalysis in the reactions with the methyl esters is due to a weaker hydrogen-bonding association with these neutral nucleophiles. Key words: cyclodextrins, catalysis, ester aminolysis.

Chlorido(4,4′-dimethoxy-2,2′-bipyridine)(1,4,7-trimethyl-1,4,7-triazacyclononane)ruthenium(II) perchlorate acetonitrile disolvate and aqua(4,4′-dimethoxy-2,2′-bipyridine)(1,4,7-trimethyl-1,4,7-triazacyclononane)ruthenium(II) bis(perchlorate) dihydrate

2012 ◽  
Vol 68 (5) ◽  
pp. m127-m130 ◽  
Author(s):  
Daniela B. Vera ◽  
Nicolás Osa Codesido ◽  
Ariel G. De Candia ◽  
Pablo Alborés ◽  
Leonardo D. Slep
Keyword(s):  
Hydrogen Bonding ◽  
Complex I ◽  
Crystal Packing ◽  
Chloride Complex ◽  
Aqua Complex ◽  
Complex Molecules ◽  
Distorted Octahedral Environment ◽  
Ru Complex ◽  
Octahedral Environment ◽  
Distorted Octahedral

The title complexes, [RuCl(C9H21N3)(C12H12N2O2)]ClO4·2C2H3N, (I), and [Ru(C9H21N3)(C12H12N2O2)(H2O)](ClO4)2·2H2O, (II), display similar structures with the Ru atom in a distorted octahedral environment. In the crystal packing of the chloride complex, (I), the Ru complex molecules are held together in pairs through C—H...Cl interactions of the 4,4′-dimethoxy-2,2′-bipyridine and chloride ligands. In the case of the aqua complex, (II), hydrogen bonding affords a tetrameric hydrogen-bonded network. These two structures are the first examples of complexes with the {Ru(1,4,7-trimethyl-1,4,7-triazacyclononane)} motif and an electron-rich substituted 2,2′-bipyridine ligand.

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