1,721,070 research outputs found
Preparative, spectral and structural studies of new metal complexes with polydentate ligands of medical applicative interest
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Utilization of waste Autoclaved Aerated Concrete as lighting material in the structure of a green roof
No full textUsually, green roofs are made with natural materials, as lapillus or pumice rock, which have the same
porous characteristic of the granular AAC. To verify if this substitution was a good hypothesis, we have
carried out chemical and physical analysis on a mixture of 70% of soil and natural peat and 30% of granular
AAC. We compared all the results with natural green roof characteristics, finding a good connection
between these two groups of values. In fact the pH value of the water extract is of 7.23; the organic matter
is less than 4.08; the apparent density is 459.2 kg/m2; the demand for high water retention capacity is
completely satisfied by the value of 222.62% of the mass of water absorbed relative to the mass of the dry
sample. For this reason, we think that the introduction of granular waste AAC within the structure of a
green roof could help to reduce industrial wastes and respects the European ideas of a sustainable future
Bis(tpp)copper(I) thiosemicarbazonates: Unexpected chemistry revealed by X-ray diffraction
No full textInvestigations into bis(triphenylphosphine)copper(I) complexes with cyclic derivatives of methylpyruvate thiosemicarbazones
No full textSynthesis, characterization, crystal structure and antiproliferative in vitro activity of long-chain aliphatic thiosemicarbazones and their Ni(II) complexes
No full textIn the course of a research on metal-based compounds active on white blood cell cancers (leukemia, lymphoma and myeloma) nine aliphatic thiosemicarbazones and their nickel complexes have been synthesized with the aim to test their effect on histiocytic lymphoma U937 cell proliferation. All compounds were characterized by elemental, IR and NMR spectra analyses and for five of the complexes also by X-ray crystallography diffraction analysis. Heptanal thiosemicarbazone and the corresponding nickel complex were chosen after a solubility/stability test to carry out preliminary experiments in vitro on human leukemia cell line U937. The complex possesses a remarkable biological activity in inhibiting cell growth and in inducing apoptosis
CHEMICAL STUDIES OF THE BEHAVIOUR OF THIOSEMICARBAZONES AS LIGANDS IN COMPLEXES OF CU(I) STABILIZED BY TRIPHENYLPHOSPHINE
No full textNATURAL ALDEHYDE THIOSEMICARBAZONES AND THEIR NICKEL COMPLEXES: SYNTHESIS, CHARACTERIZATION AND STUDIES ON THEIR BIOLOGICAL PROPERTIES
No full textSynthesis and characterization of 4-fluorobenzaldehyde thiosemicarbazone derivatives as corrosion inhibitors
No full textIn this paper, we report the syntheses, characterization and studies on the inhibition efficiency in mild steel acidic corrosion of 4-fluorobenzaldehyde thiosemicarbazone, Hfbt, 4-fluorobenzaldehyde 2-methylthiosemicarbazone, Me-fbt, and their Zn(II) complexes [Zn(fbt)2] and [Zn(Me-fbt)2]Cl2. The ligands present a good degree of activity that can be assigned to their molecular planar shape and to the presence of electron lone pairs that can interact with metal orbitals. The two zinc complexes present diametrically opposite properties: [Zn(fbt)2] is by far less active than the ligands, while [Zn(Me-fbt)2]Cl2 is the most efficient. Quantum chemical studies were carried out in an attempt to rationalize this behaviour
Bis(triphenylphosphine)4-fluorobenzaldehyde thiosemicarbazone copper(I): Forcing chelation through oxoanions
No full textThis paper reports the synthesis and characterization of six compounds of copper(I), stabilized in its reduced state by two triphenylphosphines,
in which 4-fluorobenzaldehyde thiosemicarbazone and N-methylthiosemicarbazone act as chelating through their sulfur and
imino nitrogen. The three oxoanions that have been chosen, NO3
, SO4
2 and CH3COO, play an important role: their oxygens are bad
competitors with the imino nitrogen of the thiosemicarbazone moiety and moreover they form strong charge assisted hydrogen bondings
that stabilize the neutral form of the ligand. The overall packing is determined by intermolecular phenyl–phenyl van der Waals
interactions
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