Evolution from discrete mononuclear complexes to trinuclear linear cluster and 2D coordination polymers of Mn(II) with dihydrazone Schiff bases: Preparation, structure and thermal behavior

Metal ions impact on the isostructurality and properties of 2D coordination polymers

“…The crystals of {[FeL]·0.5dmf·H 2 O} n ( 1 ) and {[CoL]·dmf} n ( 2 ) are isomorphous and isostructural to one another and with our previous published {[MnL]·dmf} n ( 3 ), 28 {[ZnL]·0.5dmf·1.5H 2 O} n ( 4 ), {[CdL]·0.5dmf·H 2 O} n ( 5 ), {[MnZnL 2 ]·dmf·3H 2 O} n ( 6 ) and {[Zn 0.75 Cd 1.25 L 2 ]·dmf·0.5H 2 O} n ( 7 ) compounds. 27 All of them crystallize in orthorhombic P 2 1 2 1 2 space group with metal atoms and ligands residing on the two fold axis.…”

“…Recently, we published the X-ray structures of five isomorphous and isostructural homo- and heteronuclear 2D coordination polymers differing in central atoms, {[M II L]· x solvent} n where M II = Mn, Zn, Cd, MnZn, Zn 0.75 Cd 1.25 . 27,28 In continuation of the previous results, we reveal here two new CPs, {[FeL]·0.5dmf·H 2 O} n ( 1 ) and {[CoL]·dmf} n ( 2 ), to study the degree of isostructurality of the entire series of compounds and the influence of metal ions on their properties. In this regard, a detailed crystallographic analysis and photoluminescent measurements were carried out, as well as an assessment of the nonlinear optical and thermoelectric properties of this series of CPs.…”

“…The synthesis of complexes 1 and 2 were carried out under solvothermal conditions similar to the previously published CPs from this series. 27,28 A mixture of metal salt (FeCl 3 ·6H 2 O 0.027 g/CoSO 4 ·7H 2 O 0.028 g, 0.1 mmol), H 2 L (0.04 g, 0.1 mmol) and solvents (dmf : ethanol = 1 : 2.33/H 2 O : dmf : ethanol = 1 : 3 : 7) was sealed in a Teflon-lined autoclave (10 mL) and heated at 120 °C for 48 h under autogenous pressure and cooled to room temperature with a rate of 0.6 °C min −1 . Products were obtained as brown (0.021 g, 1 ) and ruby crystals (0.042 g, 2 ), which were collected by filtration, washed with ethanol, and dried in air at room temperature.…”

“…The synthesis of complexes 1 and 2 were carried out under solvothermal conditions similar to the previously published CPs from this series. 27,28 A mixture of metal salt (FeCl…”

Spectrophotometric determination of Co (II) in analytical sample using anew chromogenic reagent (PTMH)

“…Schiff bases are characterized by being colored crystals (often yellow) as a weak base that decomposes with water and strong acids to form carbonyl compounds and amines. [2] This name has been given to organic compounds containing an imine group or what is known as azomethine group, which consists of a carbon atom bonded to a double bond with a nitrogen atom (C = N) [3] . The methods used to prepare the bases depend on the different nature of the substances involved in their preparation, the reaction conditions and the type of solvent used, obtaining a product with a high percentage that is distinguished by its high purity [4] .…”