Transition metal complexes with Girard reagent-based ligands. Part V. Synthesis, characterization and crystal structure of pentagonal-bipyramidal manganese(II) complex with 2,6-diacetylpyridine bis(Girard-T hydrazone)

Synthesis, characterization and crystal structures of two pentagonal-bipyramidal Fe(III) complexes with dihydrazone of 2,6-diacetylpyridine and Girard's T reagent. Anticancer properties of various metal complexes of the same ligand

“…Pentagonal-bipyramidal complexes of 2,6-diacetylpyridine bis(acylhydrazone) ligands have a wide spectrum of biological activities: cytotoxic [11], antimicrobial [9,10,13], SOD mimetic [14][15][16], DNA/RNA binding and nuclease activity [8,17,18]. In the previously published papers [19][20][21], synthesis, characterization and antimicrobial activity of 2,2'- [2,6-pyridinediylbis(ethylidyne-1-hydrazinyl-2-ylidene)]bis[N,N,N-trimethyl-2-oxoethanaminium] dichloride (H2LCl2) and its corresponding Mn(II) (1), Ni(II) (2), Co(II) (3 and 4), Zn(II) (5) and…”

Molecular Structures and Spin‐States of Pseudohalide Metal Complexes with Hydrazones of Girard's T Reagent

“…The values of the effective magnetic moments for complexes 10 , 13 , and 11 measured at room temperature ( µ eff = 5.89 µ B , µ eff = 3.94 µ B , and µ eff = 4.98 µ B , respectively) correspond to high‐spin states of metal(II) in the complexes , . The electronic absorption spectra of complexes 11 and 12 each showed the presence of the pentagonal‐bipyramidal complex cation.…”

“…Isothiocyanato complexes of Mn II {[Mn( H 2 L 4 )(NCS) 2 ](SCN) 2 · CH 3 OH} ( 10 ), Co II {[Co( H 2 L 4 )(NCS) 2 ](SCN) 2 · 2 H 2 O ( 11 ) and [Co( H 2 L 4 )(NCS) 2 ][Co(NCS) 4 ] · 2 H 2 O ( 12 )}, Ni II {[Ni( H 2 L 4 )(NCS) 2 ](SCN) 2 · 2 H 2 O ( 13 )}, Zn II {[Zn( H 2 L 4 )(NCS) 2 ][Zn(NCS) 4 ] · 2 H 2 O ( 14 )}, and Cd II {[Cd( H 2 L 4 )(NCS) 2 ][Cd(NCS) 4 ] · 2 H 2 O ( 15 )} with the condensation product of 2,6‐diacetylpyridine and the Girard T reagent ( H 2 L 4 Cl 2 , Scheme ) were obtained from the dihydrazone ligand, NH 4 SCN, and the corresponding metal(II) salts [chloride in the cases of Mn II ( 10 ), Ni II ( 13 ), Co II ( 11 and 12 ), and Zn II ( 14 ) complexes or nitrate in the case of Cd II complex ( 15 )]. X‐ray analysis of the Mn II , Ni II , and Zn II complexes 10 , 13 , and 14 , respectively, and of the two Co II complexes 11 and 12 showed pentagonal‐bipyramidal (PBPY‐7) coordination in the surroundings of the metal(II), consisting of dihydrazone ligand symmetrically coordinated through N 3 O 2 donor atoms in the equatorial plane and two N‐coordinated NCS – monodentate ligands in axial positions . In contrast with complexes 10 , 11 , and 13 , in complexes 12 , 14 , and 15 the counterion of the PBPY‐7 complex cation is anionic tetrahedral [M(NCS) 4 ] 2– instead of two SCN – ligands …”

“…X‐ray analysis of the Mn II , Ni II , and Zn II complexes 10 , 13 , and 14 , respectively, and of the two Co II complexes 11 and 12 showed pentagonal‐bipyramidal (PBPY‐7) coordination in the surroundings of the metal(II), consisting of dihydrazone ligand symmetrically coordinated through N 3 O 2 donor atoms in the equatorial plane and two N‐coordinated NCS – monodentate ligands in axial positions . In contrast with complexes 10 , 11 , and 13 , in complexes 12 , 14 , and 15 the counterion of the PBPY‐7 complex cation is anionic tetrahedral [M(NCS) 4 ] 2– instead of two SCN – ligands …”

“…That review also covers some pseudohalide metal complexes with Girard T reagent hydrazones reported up until 2012 , . In recent years our two research groups (K. Anđelković and co‐workers and I. Turel and co‐workers) have made significant contributions in research into coordination chemistry of pseudohalide metal complexes with Girard T reagent hydrazones . A summary of pseudohalide metal complexes with Girard T reagent hydrazones reported until now is given in Table .…”