Synthesis and Crystal Structures of Bis(1‐{(E)‐2‐pyridinylmethylidene}‐semicarbazone)iron(II) and ‐copper(II) Diperchlorate Monohydrates

Abstract

The pyridine-2-carbaldehyde semicarbazone ligand (HL) reacts with iron(II) and copper(II) perchlorates in boiling ethanol to yield red-violet [Fe II (HL) 2 ](ClO 4 ) 2 · H 2 O (1) and light-green crystals [Cu II (HL) 2 ](ClO 4 ) 2 · H 2 O (2). The crystals are triclinic with the metal ions in an octahedral environment, coordinated to two nitro-1801 gen and one oxygen-donor atom from HL. Electronic, magnetic and electrochemical properties are presented as well.www.zaac.wiley-vch.de 1805 disc electrode and a platinum wire were used as working and auxiliary electrodes, respectively. Potentials were measured against a Ag/AgCl reference electrode (0.22234 V vs SHE).Microanalyses were done at the Instituto de Química-USP, Brazil.

Structural, Magnetic, Spectroscopic and Density Functional Theory (DFT) Analysis of Bis((1‐((E)‐2‐pyridinylmethylidene)semicarbazone)copper(II)sulfate) Dihydrate Complex.

“…In comparison to the semicarbazone that has shown to stabilize mononuclear complexes of copper(II), the thiosemicarbazone analogue (HL) tends to favor dinuclear complexes when reacts with copper(II), such as [{CuL(CH 3 CO 2 )} 2 ] and [{CuHL(SO 4 )} 2 ] ,. In this case, the sulfato‐complex also exhibits a μ‐oxo bridging mode between the copper ions that lie in a distorted square‐pyramidal geometry.…”

Crystal structure of 4-formylpyridine semicarbazone hemihydrate

“…For the crystal structure of 4-formylpyridine thiosemicarbazone, see: Restivo & Palenik (1970). For the crystal structures of 2-formylpyridine semicarbazone and several coordination compounds published by our group, see: Garbelini et al (2008Garbelini et al ( , 2009Garbelini et al ( , 2011Garbelini et al ( , 2012. Geometrical analysis was performed with Mogul (Bruno et al, 2004…”

Bis(ethanol-κO)bis(pyridine-3-carbaldehyde-κNthiosemicarbazone)bis(thiocyanato-κN)iron(II)–pyridine-3-carbaldehyde thiosemicarbazone (1/2)

“…Several crystal structures of metal complexes based on Schiff base ligands being synthesized by condensation of pyridine-3-carbaldehyde and amino compounds have been previously reported (Brook et al, 2000;Deng et al, 2007;Garbelini et al, 2008;Kowol et al, 2007;Zhong et al, 2007). However, with regard to pyridine-3-carbaldehyde thiosemicarbazone (pct), only the corresponding Mn(II) complex has been documented (Li et al, 2006).…”