Synthesis, Structural Characterization, and Biological Activities of Organically Templated Cobalt Phosphite (C4N2H14)[Co(H2PO3)4]·2H2O

Abstract

A novel hybrid phosphite (C4N2H14)[Co(H2PO3)4]·2H2O was synthesized with 1,4- diaminobutane (dabn) as a structure-directing agent using slow evaporation method. Single crystal X-ray diffraction analysis showed that it crystallizes in the P\-1 triclinic space group, with the following unit cell parameters (Å, °) a = 5.4814 (3), b = 7.5515 (4), c = 10.8548 (6), α = 88.001 (4), β = 88.707 (5), γ = 85.126 (5), and V = 447.33 (4) Å3. The crystal structure was built up from corner-sharing [CoO6]-octahedrons, forming chains parallel to [001], which are interconnected by H2PO3− pseudo-tetrahedral units. The diprotonated 1,4-butanediammonium molecules, residing between the parallel chains, interacted with the inorganic moiety via hydrogen bonds leading thus to the formation of the 3D crystal structure. The Fourier transform infrared spectrum showed characteristic bands corresponding to the phosphite group and the organic molecule. The thermal decomposition of the compound consisted mainly of the loss of the organic moiety and the water molecules. The biological tests exhibited significant activity against Candida albicans and Escherichia coli strains in all used concentrations, while less activity was pronounced when tested against Staphylococcus epidermidis and Saccharomyces cerevisiae, while there was no activity against the nematode model Steinernema feltiae.

Role of Metal Ion Sites in Bivalent Cobalt Phosphorus Oxygen Systems toward Efficient Oxygen Evolution Reaction

“…The CP-2 shows bands at 513 and 590 cm –1 corresponding to the stretching vibration of Co–O and the deformation of Co–O–H (Figure b) . The band at 997 cm –1 corresponds to the bending mode of P–H . The band at 1068 cm –1 belongs to P–O stretching vibrations.…”

“…41 The band at 997 cm −1 corresponds to the bending mode of P−H. 42 The band at 1068 cm −1 belongs to P−O stretching vibrations. Furthermore, broad bands observed at 1630, 3448, and 3514 cm −1 are related to hydroxyl groups.…”

Preparation and properties of epoxy/basalt flakes anticorrosive coatings

“…Among various anticorrosion technologies, using organic coatings to isolate corrosion factors, such as water, oxygen, is the most economical and convenient method . Epoxy is such a choice of organic coating, and it has advantages over others due to its excellent adhesion, low curing shrinkage, good mechanical properties, and chemical inertness .…”