Conceiving an experimental discipline: a contribution to general chemistry

The purpose of this paper is to present a classification criterion for general chemistry experiments departing from a survey of 35 years of the experimental general chemistry discipline at the Chemistry Institute - UNICAMP. It is shown that by considering the most remarkable characteristics of an experiment and classifying it under Conceptual, Fundamental, Methodological or Quantitative criterion, teachers could better develop the discipline plan and prevent a subject superposition. Taking into account the system Fe3+/SCN- , the article also exemplify how is possible to modify an experimental approach and to conceive other procedures with different didactic purposes.1818182

N′-[(E)-4-Methylbenzylidene]pyridine-4-carbohydrazide monohydrate

In the title hydrate, C14H13N3O·H2O, the C=N double bond adopts an E conformation and the dihedral angle between the aromatic rings is 16.36 (10)°. In the crystal, N—H...O, O—H...O and O—H...N hydrogen bonds link the components into (001) sheets

Crystal structure of 3-methoxycarbonyl-2-(4-methoxyphenyl)-8-oxo-1-azaspiro[4.5]deca-1,6,9-trien-1-ium-1-olate

The title compound, C18H17NO5, was prepared by a synthetic strategy based on the Heck reaction from Morita–Baylis–Hillman adducts. The five-membered ring adopts a slightly twisted conformation on the Ca—Cm (a = aromatic and m = methylene) bond. The dihedral angle between the five-membered ring and the spiro aromatic ring is 89.35 (7)°; that between the five-membered ring and the 4-methoxybenzene ring is 4.65 (7)°. Two short intramolecular C—H...O contacts occur. In the crystal, molecules are linked by C—H...O hydrogen bonds to generate a three-dimensional network

White-light generation from all-solution-processed OLEDs using a benzothiazole–salophen derivative reactive to the ESIPT process

CNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORA salicylidene derivative, N,N′-bis(salicylidene)-(2-(3′,4′-diaminophenyl)benzothiazole) (BTS), reactive in the Excited State Intramolecular Proton Transfer (ESIPT) process, was synthesized and its photophysical properties were evaluated, presenting an em21311721182CNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORsem informação2013/16245-2sem informaçãoThe authors are thankful for financial support and scholarships from CNPq, FAPESP 2013/16245-2, FAEPEX and INEO. This research was supported in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001 an

Synthesis, crystallographic studies, molecular modeling and in vitro biological studies of silver(I) complexes with aminoadamantane ligands

Silver(I) complexes with amantadine (atd) and memantine (mtn) were synthesized and characterized. Elemental, thermogravimetric and mass spectrometric analyses indicated a 1:2 metal/ligand ratio, with the molecular composition AgC20H34N2 center dot NO3 for Ag-atd and AgC24H42N2 center dot NO3 center dot H2O for Ag-mtn. The crystal structures of the silver(I) complexes were determined by single crystal X-ray diffractometric studies and show the coordination of amantadine and memantine to the Ag(I) ion by the nitrogen atom of the NH2 group. The spectral analysis by infrared and H-1, C-13 and {N-15, H-1} nuclear magnetic resonance (NMR) spectroscopies confirmed the coordination sites of the ligands to the silver ions. Computational studies revealed modes of vibration and bond lengths similar to those found experimentally. The in vitro antibacterial activity assays showed that amantadine is not active over the tested strains while memantine showed a low activity against Staphylococcus aureus and Pseudomonas aeruginosa. On the other hand, the complexes had a pronounced antibacterial activity over the same strains with minimum inhibitory concentration (MIC) values in the micromolar range. Biophysical assays based on fluorescence spectroscopy indicated that the silver(I) complexes interact weakly with bovine serum albumin, while agarose gel electrophoresis and competitive binding experiments revealed that the compounds interact with DNA by non-covalent interactions.173CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP407012/2018-4; 164658/20181Sem informação2013/22127-2; 2014/50906-9; 2015/20882-3; 2017/25995-6; 2018/12062-4; 2018/12590-