Über Komplexverbindungen von Glykolen

Grün, Ad.; Boedecker, E.

doi:10.1002/cber.191004301180

Cited by 15 publications

(5 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…acetonitrile during elution (Figure S3 †). Nevertheless, the overall tendency clearly leans toward mononuclear species in solution, being in agreement with the postulated and experimentally determined crystal structures [22,27,28] . The reduction behavior is different to that of nickel acetate, in that the necessary temperature to induce a quick reduction to Ni 0 exceeds 280 °C, which is in agreement with the slow formation of intermetallic compounds explained below.…”

Section: Resultssupporting

confidence: 87%

Mechanism of Bi−Ni Phase Formation in a Microwave‐Assisted Polyol Process

et al. 2020

View full text Add to dashboard Cite

Typically, intermetallic phases are obtained in solid‐state reactions or crystallization from melts, which are highly energy and time consuming. The polyol process takes advantage of low temperatures and short reaction times using easily obtainable starting materials. The formation mechanism of these intermetallic particles has received little attention so far, even though a deeper understanding should allow for better synthesis planning. In this study, we therefore investigated the formation of BiNi particles in ethylene glycol in a microwave‐assisted polyol process mechanistically. The coordination behavior in solution was analyzed using HPLC‐MS and UV‐Vis. Tracking the reaction with PXRD measurements, FT‐IR spectroscopy and HR‐TEM revealed a successive reduction of Bi3+ and Ni2+, leading to novel spherical core‐shell structure in a first reaction step. Bismuth particles are encased in a matrix of nickel nanoparticles of 2 nm to 6 nm in diameter and oxidation products of ethylene glycol. Step‐wise diffusion of nickel into the bismuth particle intermediately results in the bismuth‐rich compound Bi3Ni, which consecutively transforms into the BiNi phase as the reaction progresses. The impacts of the anion type, temperature and pH value were also investigated.

show abstract

Section: Resultssupporting

confidence: 87%

Mechanism of Bi−Ni Phase Formation in a Microwave‐Assisted Polyol Process

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The compounds 3 and 4 were already prepared by Grün and later these two as well as 5 were described by Knetsch and Groeneveld , but no crystallographic data has been published. The three compounds are isostructural and crystallize in the monoclinic space group C 2/ c .…”

Section: Resultsmentioning

confidence: 99%

“…First syntheses of 3d‐metal complexes with neutral (i.e. uncharged) EG ligands were described more than a century ago by Grün , . In the 1970s, Antti published the crystal structures of some complexes obtained from 3d‐metal chlorides or sulfates and EG.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Common Anions on the Coordination of Metal Cations in Polyalcohols

Teichert

Ruck

2019

Eur J Inorg Chem

View full text Add to dashboard Cite

Polyalcohols (polyols), such as ethylene glycol, have mild reducing ability. They are used in the so‐called polyol process to produce metallic nanoparticles of various kinds. In these syntheses, the effective reduction potential of the polyol strongly depends on the presence of other anions. Those anions compete against the polyol molecules for the direct bonding to the metal cations. As an indicator for the coordination behavior of polyols, we crystallized and structurally characterized 19 new coordination compounds with Mn, Co, Ni, Cu, Zn, Cd, Pb, or Bi. 15 of these compounds comprise nitrate ions, the others acetate ions. Compared to the already known chloride and sulfate analogues, nitrate shows an intermediate coordination affinity towards the metal cations considered here. While no direct metal–nitrate coordination occurs with Co2+, Ni2+, and Zn2+, mixed nitrate–polyol coordination environments are found for Mn2+, Cu2+, Cd2+, and Bi3+. Because of its strong chelating property, the acetate ion always coordinates the metal cation, competing with the polyol. The first mononuclear and dinuclear metal acetate diol coordination compounds were obtained with Co2+ and Cu2+, respectively. The coordination affinity of nitrate and acetate ligands in solid metal polyol complexes fully corresponds with our recent observations of the anion‐dependent reduction behavior of copper(II) salts in polyols.

show abstract

“…Somewhat similar to the ferrous dipyridyl compound is the ferrous complex with a-pyridylhydrazine NH2-NH2) Fe Cl2 described by Emmert and Schneider (62). d. Two -OH groups (both coordinating) A great number of compounds were prepared by Grim and his coworkers (91,92) in which ethylene glycol and several other 1,2-glycols, propyleneglycol, pinacol, etc., were coordinated to metals. Three molecules of the glycol but never more entered the compounds, corresponding to ring formation of the type: Glycerol acts in a similar manner (93), but as three molecules always enter into the complex probably only two hydroxyl groups are coordinated, the third being left free, that is, glycerol functions as a bidentate rather than a tridentate molecule.…”

Section: C2hb-c-c-chsmentioning

confidence: 98%

The Chelate Rings.

Diehl¹

1937

Chem. Rev.

View full text Add to dashboard Cite

Über Komplexverbindungen von Glykolen

Cited by 15 publications

References 1 publication

Mechanism of Bi−Ni Phase Formation in a Microwave‐Assisted Polyol Process

Mechanism of Bi−Ni Phase Formation in a Microwave‐Assisted Polyol Process

Influence of Common Anions on the Coordination of Metal Cations in Polyalcohols

The Chelate Rings.

Contact Info

Product

Resources

About