Ethylenediamine

About: Ethylenediamine is a research topic. Over the lifetime, 8843 publications have been published within this topic receiving 124366 citations. The topic is also known as: 1,2-Diaminoethane & 1,2-Ethanediamine.

Strong CO2 binding in a water-stable, triazolate-bridged metal-organic framework functionalized with ethylenediamine

Abstract: Reaction of CuCl2·2H2O with 1,3,5-tris(1H-1,2,3-triazol-5-yl)benzene (H3BTTri) in DMF at 100 °C generates the metal−organic framework H3[(Cu4Cl)3(BTTri)8(DMF)12]·7DMF·76H2O (1-DMF). The sodalite-type structure of the framework consists of BTTri3−-linked [Cu4Cl]7+ square clusters in which each CuII center has a terminal DMF ligand directed toward the interior of a large pore. The framework exhibits a high thermal stability of up to 270 °C, as well as exceptional chemical stability in air, boiling water, and acidic media. Following exchange of the guest solvent and bound DMF molecules for methanol to give 1-MeOH, complete desolvation of the framework at 180 °C generated H3[(Cu4Cl)3(BTTri)8] (1) with exposed CuII sites on its surface. Following a previously reported protocol, ethylenediamine molecules were grafted onto these sites to afford 1-en, featuring terminal alkylamine groups. The N2 adsorption isotherms indicate a reduction in the BET surface area from 1770 to 345 m2/g following grafting. The H2 adso...

Molecular Fluorescence in Citric Acid-Based Carbon Dots

Abstract: Nitrogen-doped carbon dots synthesized from citric acid as a carbon precursor have recently been considered to contain fluorescent derivatives of citrazinic acid, which contribute to their emission in the blue spectral range. To study the impact of such molecular fluorescent species on the optical properties of carbon dots, we synthesized three samples employing citric acid and three different nitrogen sources: ethylenediamine, hexamethylenetetramine, and triethanolamine. On the basis of the analysis of the nitrogen content and its coordination by X-ray photoelectron spectroscopy, FTIR spectra, and systematically comparing absorption, steady-state emission, and photoluminescence decays of each kind of carbon dot, we derive the influence of the molecular precursors and gain further understanding of the complex structure of carbon dots highlighting the strong impact of molecular fluorescence in the samples produced with ethylenediamine and hexamethylenetetramine.

Structure-activity relationships for cytotoxic ruthenium(II) arene complexes containing N,N-, N,O-, and O,O-chelating ligands

Abstract: We report structure−activity relationships for organometallic RuII complexes of the type [(η6-arene)Ru(XY)Cl]Z, where XY is an N,N- (diamine), N,O- (e.g., amino acidate), or O,O- (e.g., β-diketonate) chelating ligand, the arene ranges from benzene derivatives to fused polycyclic hydrocarbons, and Z is usually PF6. The X-ray structures of 13 complexes are reported. All have the characteristic “piano-stool” geometry. The complexes most active toward A2780 human ovarian cancer cells contained XY = ethylenediamine (en) and extended polycyclic arenes. Complexes with polar substituents on the arene or XY = bipyridyl derivatives exhibited reduced activity. The activity of the O,O-chelated complexes depended strongly on the substituents and on the arene. For arene = p-cymene, XY = amino acidate complexes were inactive. Complexes were not cross-resistant with cisplatin, and cross-resistance to Adriamycin was circumvented by replacing XY = en with 1,2-phenylenediamine. Some complexes were also active against colon,...