Oana Grad

Oana Grad
National Institute for Research and Development of Isotopic and Molecular Technologies | INCDTIM · Department of Mass Spectrometry, Chromatography and Applied Physics

Dr. Dipl. Eng.

About

23
Publications
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166
Citations

Publications

Publications (23)
Article
Full-text available
MIL-53 and the MIL-53–Al2O3 composite synthesized by a solvothermal procedure, with water as the only solvent besides CrCl3 and benzene-1,4-dicarboxylic acid (BDC), were used as catalytic supports to obtain the novel MIL-53-based catalysts Ni(10 wt.%)/MIL-53 and Ni(10 wt.%)/MIL-53–Al2O3. Ni nanoparticle deposition by an adapted double-solvent metho...
Article
The chromium terephthalate MIL-101 is a mesoporous metal-organic framework (MOF) with unprecedented adsorption capacities due to the presence of giant pores. The application of an external pressure can effectively modify the open structure of MOFs and its interaction with guest molecules. In this work, we study MIL-101 under pressure by synchrotron...
Article
This work presents a new, simple and accessible method to prepare PdAu alloyed nanoparticles supported on reduced graphene oxide (PdAu/rGO) with Pd and Au concentrations of 7.5 and 2.5 wt%, respectively. The prepared composite exhibits superior activity, selectivity and stability for the FA decomposition reaction in comparison to Pd/rGO (Pd 10 wt%)...
Article
A novel Ni(10 wt.)/MIL-101-Al2O3 catalyst was prepared by use of immobilized MIL-101 on alumina pellets as catalytic support, with Ni nanoparticles deposited by an adapted double solvent approach. MIL-101-Al2O3 composite was obtained by two successive depositions of MIL-101 on γ-Al2O3 (0.2 < dp < 1.5 mm). N2 adsorption-desorption isotherms prove th...
Article
The development of effective methods for hydrogen storage is of paramount importance in using hydrogen as a transportation fuel for on-board applications. The rate at which the hydrogen is adsorbed/desorbed on porous materials in compressed pellets is directly related to the thermal conductivity of the adsorbent. This work aims to increase the hydr...
Article
Full-text available
This paper presents a new, simple, accessible and environmentally friendly method to prepare gold-reduced graphene oxide composites (Au/rGO) with gold concentration of 2.5 wt%, 5 wt% and 10 wt%. The Au/rGO materials with low Au concentration present AuNPs of low dimensions and proved good catalytic activity for formic acid (FA) decomposition in aqu...
Article
Ni(10 wt%)@UiO-66 and Ni(10 wt%)@MIL-101 composites were prepared by the classical impregnation method (IMP) and the “double solvent method” (DS), followed by the rapid and simple reduction of Ni ²⁺ to Ni ⁰ by aqueous solution of NaBH 4 . Structural characterization by BET, XRD, TGA, SEM/EDX, EELS, XPS showed that Ni nanoparticles of maximum 4 nm a...
Article
Starting from (1S,2S)-2-amino-1-(4-nitrophenyl)propane-1,3-diol (p-nitrophenylserinol, a waste optical antipode product from chloromycetin production) or its 5-amino-1,3-dioxane derivatives, we report preliminary data concerning the conversion of these optically active substrates into novel N-modified glycines by chemoselective N-monoalkylation wit...
Article
Full-text available
The unconventional methodology for the non-epimerizable cycloacetalization of optically active (1S,2S)-2-amino-1-(4-nitrophenyl)propane-1,3-diol (p-nitrophenylserinol) (condensed H 2 SO 4 96% as solvent and catalyst, i.e., sulfuric transacetalization) producing (2R,4S,5S) diamino-1,3-dioxanes was enlarged by the use of N-protected forms of 2,2-dime...
Article
We report, herein, the synthesis of new push–pull chromophores that incorporate a diazine ring as the electron-withdrawing part and an N,N-dimethylaniline moiety as the electron-donating part. Both of which are connected to a fluorene core. The length of the conjugated backbone was increased by incorporating ethynyl linkers and triazole rings on th...
Article
The thiaminalisation of 2-amino-2-(mercaptomethyl)propane-1,3-diol [‘2-(hydroxymethyl)cysteinol’] with aryl(di)aldehydes is reported. The resulting new class of 2-aryl-4,4-bis(hydroxymethyl)-1,3- thiazolidines is investigated by NMR and IR spectroscopy in tandem with DFT calculations, permitting structural assignments that are discussed in terms of...
Article
The first use of a spiranic diamino-nucleophile, 7,11,18,21-tetraoxa-3,15-diazatrispiro[5.2.2.5.2.2]heneicosane, as linker in the synthesis of dendritic melamines, is reported. The chirality of a C(a)4 and/or a C(a)2(b)2 spiranic carbon is discussed and, for the first time, assigned. The nature of exocyclic ligands in aza-positions N-3, -15 leading...
Article
Full-text available
The iterative chemoselective amination of cyanuric chloride to dimers of new G-2 dendritic N-substituted-2,4,6-triamino-s-triazines (melamines) having C-2-substituted 2-aminopropane-1,3-diols (‘serinols’) in tandem with the ethylene ketal of 4-piperidone as peripheral units is reported. The structure as a function of increasing molecular size was s...
Article
Full-text available
The highly chemoselective preparation of new elaborated N-unsymmetrically substituted chlorodiamino-s-triazines and melamines, seen as building-blocks for iterative synthesis, is reported. It consisted of amination of cyanuric chloride with commercial C-2-substituted 2-aminopropane-1,3-diols (“serinols”), playing the role as “open-chain” unit and e...
Article
Full-text available
The direct cyclocondensation between 2-amino-2-(mercaptomethyl) propane-1,3-diol (“hydroxymethyl-cysteinol”) with arylaldehydes was investigated as feasibility and efficiency. A new family of C-substituted 1,3-thiazolidines was obtained and fully characterised.
Article
Full-text available
Starting from 4-piperidone monohydrate hydrochloride (or the hydrochloride of its ethylene ketal) alone, otherwise in tandem with a C-2-substituted 2-aminopropane-1,3-diol (“serinol”) as amino-nucleophiles in reaction with cyanuric chloride, the synthesis of novel N-substituted amino-s-triazines is reported. The stereochemistry of rotational phenom...
Article
Full-text available
The use of the so-called NMR "mobile protons" in investigation of restricted rotational phenomena about partial double bonds, i.e. Csp2(s-triazine)-N(exocyclic), is examined in the case of twelve highly elaborated amino-s-triazines.
Article
Using iterative aminations of cyanuric chloride, we account the concise synthesis of a dimeric melamine based G-2 dendrimer having 1,4-dioxa-8-azaspiro[4.5]decane (piperidone ethyleneketal) in tandem with 2-amino-2-hydroxymethylbutanol ("ethylserinol") as peripheral groups piperazine and 4,4'-bispiperidine as internal and central linker, respective...

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