An insight to the role of perchlorate counter ions and different non-covalent interactions in the solid state structures of mono-anionic malonic acid bridged trinuclear mixed valence cationic complexes of cobalt with tetradentate N2O2 donor ligands

Synthesis, Characterization and Structural Analysis of Two New Biguanide Complexes

“…The asymmetric unit is formed by one cationic complex, one cobalt tetrachloride anionic complex, one chloride anion and three water molecules (Figure 2). Although the production of mixed-valent cobalt complexes has been studied for a long time using different ligands [17][18][19][20][21][22], as far as we know, this is the first metformin complex with a Co(II)/Co(III) mixed-valence metallic center.…”

“…The asymmetric unit is formed by one cationic complex, one cobalt tetrachloride anionic complex, one chloride anion and three water molecules (Figure2). Although the production of mixed-valent cobalt complexes has been studied for a long time using different ligands[17][18][19][20][21][22], as far as we know, this is the first metformin complex with a Co(II)/Co(III) mixed-valence metallic center.The cationic complex is formed by one Co(III) metallic center coordinated by three metformin molecules bonded through the nitrogen atoms in a CoN 6 arrangement, generating a distorted octahedral polyhedron (Figure2). The anionic complex is formed by one Co(II) center coordinated by four chloride atoms forming a tetrahedral arrangement (Figure2).…”

Application of a distinctly bent, trinuclear, end-to-end azide bridged, mixed valence cobalt(iii/ii/iii) complex in the fabrication of photosensitive Schottky barrier diodes

“…Focusing on cobalt, carboxylate-bridged trinuclear mixed valence complexes are very common. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] In these complexes, the central cobalt is in the +2 state and is present in the O 6 donor environment, whereas terminal cobalt centers are in the +3 state and are present in N 3 O 3 or N 2 O 4 donor environments. The Co(III)-Co(II)-Co(III) angle is not less than 150°(if not more) in most of the cases and the complexes may be considered as linear trinuclear Co(III)-Co(II)-Co(III) complexes.…”

“…The Co(III)-Co(II)-Co(III) angle is not less than 150°(if not more) in most of the cases and the complexes may be considered as linear trinuclear Co(III)-Co(II)-Co(III) complexes. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] The bridging carboxylates are trans to one another in most of the cases, 17,[28][29][30][31][32][36][37][38] although cis orientations are also found in some cases. 23,24,28,39 Few such complexes were also used to fabricate opto-electronic devices.…”

Fabrication of Schottky barrier diodes utilizing carboxylate bridged trinuclear mixed valence cobalt(iii/ii/iii) complexes of tetradentate N2O2donor reduced Schiff base ligands

“…[20][21][22][23][24][25] The mixed valence complexes of cobalt are also available in the literature and their magnetic properties are studied. [26][27][28][29][30][31][32] It is interesting to note that cobalt may form a variety of simple mononuclear, [33][34][35][36][37] dinuclear, [38][39][40][41][42] trinuclear [43][44][45][46][47][48] and many other polynuclear complexes [49][50][51][52][53][54] depending on the ligands used and the reaction conditions. Salen type tetradentate Schiff bases have been proved over many years to offer very good ligand systems for the synthesis of cobalt complexes.…”