Diastereotopic groups in two new single-enanti-omer structures ()P(O)[NH-(+)CH(CH)(CH)] ( = OCH and CH).

The crystal structures of two single-enanti-omer compounds, diphenyl [()-(+)-α-ethyl-benzyl-amido]-phosphate, CHNOP or (CHO)P(O)[NH-()-(+)CH(CH)(CH)] (), and -[()-(+)-α-ethyl-benz-yl]-,-di-phenyl-phosphinic amide, CHNOP or (CH)P(O)[NH--(+)CH(CH)(CH)] (), were studied. The different environments at the phospho-rus atoms, (O)P(O)(N) and (C)P(O)(N), allow the P=O/P-N bond strengths to be compared, as well as the N-H⋯O=P hydrogen-bond strengths, and P=O/N-H vibrations. The following characteristics related to diastereotopic CHO/CH groups in / were considered: geometry parameters, contributions to the crystal packing, solution C/H NMR chemical shifts, conformations, and NMR coupling constants.

Multifunctional Tetracycline-Loaded Silica-Coated Core-Shell Magnetic Nanoparticles: Antibacterial, Antibiofilm, and Cytotoxic Activities.

In the current study, the physicochemical and biological properties of tetracycline-loaded core-shell nanoparticles (Tet/NiCoFeO/SiO and Tet/CoFeO/SiO) were investigated. The antibacterial activity of nanoparticles alone and in combination with tetracycline was investigated against a number of Gram-positive and Gram-negative bacteria for determining minimum inhibitory concentration (MIC) values. The MIC of Tet/NiCoFeO/SiO nanoparticles turned out to be significantly higher than that of Tet/CoFeO/SiO nanoparticles.

Synthesis of graphene by in situ catalytic chemical vapor deposition of reed as a carbon source for VOC adsorption.

Few-layer graphene was synthesized by in situ catalytic carbon vapor deposition (CCVD) method, using reed as a carbon source and Ni, Cu, and Mg salts as the catalyst compounds. The synthesized graphene was also used for adsorption of VOCs. Furthermore, the effect of organic additives, sorbitol, and citric acid on catalyst compounds was investigated by temperature-programmed reduction analysis (H-TPR).

Charge-transfer complexes of 4-nitrocatechol with some amino alcohols.

Charge-transfer (CT) complexes formed from the reactions of 4-nitropyrocatechol (4-nCat) as an electron acceptor with four amino alcohols: 2-aminoethanol, 1-amino-2-propanol, 4-aminobutanol and N-(2-hydroxyethyl)-1,3-diaminopropane (NHEDAP) as electron donors, have been studied spectrophotometrically in H(2)O and H(2)O/EtOH at 20, 25, 30, 35 and 40 degrees C. The calculated values of the oscillator strength and transition moment confirm the formation of CT-complexes. The thermodynamic and spectroscopic parameters were also evaluated for the formation of CT-complexes.

Dopaminium perchlorate.

IN THE TITLE COMPOUND [SYSTEMATIC NAME: 2-(3,4-dihydroxy-phen-yl)ethanaminium perchlorate], C(8)H(12)NO(2) (+)·ClO(4) (-), the cations and anions are linked into three-dimensional structure via inter-molecular N-H⋯O and O-H⋯O hydrogen bonds.