311 research outputs found
Synthesis, crystal structure and antibacterial activity of manganese(III) and cobalt(III) complexes containing pentadentate Schiff bases of a common amine and thiocyanate
No full textFour new mononuclear Schiff base manganese(III) and cobalt(III) complexes viz. [Mn(L-1)(NCS)] (1), [Mn(L-2)(NCS)] (2), [Co(L-3)(NCS)] (3), and [Co(L-4)(NCS)]center dot 0.5CH(3)OH center dot 0.5H(2)O (4), containing thiocyanate as a common pseudohalide ion are reported. The pentadentate Schiff base ligands H2L1, H2L2, H2L3, and H2L4 were obtained by the condensation of substituted salicylaldehydes with N-(3-aminopropyl)-N-methylpropane-1,3-diamine. The syntheses of the complexes have been achieved by the reaction of manganese(II) perchlorate or cobalt(II) perchlorate with the respective Schiff bases in the presence of thiocyanate in methanol medium. Complexes 1-4 have been characterized by microanalytical, spectroscopic, single-crystal X-ray diffraction and other physicochemical studies. Structural studies reveal that 1-4 adopt nearly similar structures containing the MN4O2 (M = Mn, Co) chromophore in which each central M(III) ion adopts a distorted octahedral geometry. Weak intermolecular H-bonding interactions are operative in these complexes to bind the molecular units. The antibacterial activity of 1-4 and their constituent Schiff bases has been tested against some common bacteria
Structural characterization of spray-dried microgranules by spin-echo small-angle neutron scattering
No full textSpray-drying is a widely used industrial technique and has shown an immense potential in the fields of nanoscience and technology. This is due to its ability to synthesize microgranules consisting of correlated nanostructures using evaporation induced assembly through bottom-up approach. Although the nature of correlation among the constituent nanoparticles and their size distribution could earlier be obtained by conventional Small-angle Scattering (SAS) technique, a statistically averaged quantitative measure of the shell thickness and hollowness of the formed granules remained a challenge. In this work, we have used Spin-echo Small-angle Neutron Scattering (SESANS) technique to characterize spray-dried nanostructured microgranules having different hollowness. It is shown that this non-destructive technique provided precise quantification of the granular sizes and hollowness by utilizing polarization property of neutrons in real space directly.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.RST/Neutron and Positron Methods in Material
RGe(I)Ge(I)R compound (R = PhC(NtBu)2) with a Ge−Ge single bond and a comparison with the gauche conformation of hydrazine.
No full textThis article reports the reduction of the chloride [PhC(NtBu)(2)]GeCl with potassium in THF to afford the reddish crystals of [PhC(NtBu)(2)](2)Ge-2 (2). The molecule of 2 contains a Ge-Ge bond. The X-ray structure and DFT calculation indicate that the Ge-Ge bond possesses an unusual gauche-bent geometry. The Ge-Ge bond length in 2 is 2.570 angstrom, which is very close to the single Ge-Ge interaction (2.61 angstrom) but significantly longer than that for typical digermenes, R2GeGeR2 (2.21-2.51 angstrom) and the two structurally characterized digermynes (2.2850 angstrom and 2.2060 angstrom), which proves that there is no multiple bond character in 2
Inter-particle interaction dependent evaporation-induced assembly in contact-free micro-colloidal droplets
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