Coordination compounds of 3d-metal valerates and benzoates with nicotinamide

Coordination compounds of cobalt(II), nickel(II), and zinc(II) valerates and benzoates with isonicotinic acid hydrazide

“…We have earlier investigated the products of the reaction of biometals valerates and benzoates with semicarbazide [5] and nicotinamide [6][7][8][9][10][11]. In the present work we report on synthesis of the complexes of cobalt(II), nickel(II), and zinc(II) valerates and benzoates with isonicotinic hydrazide, I-VI (Scheme 1).…”

“…Heterocyclic nitrogen atom did not participate in the binding with metals, as confirmed by the unchanged location of the pyridine ring bands (around 1600 cm -1 ). Earlier examples of certain 3d-metals valerates and benzoates have revealed that participation of heterocyclic nitrogen atom in the coordination with metals should have increased the latter mentioned bands frequency [6][7][8][9]11]. The breathing bands of the heterocycle at 1000 cm -1 were practically not changed as well.…”

“…Analysis of the X-ray diffraction and IR spectroscopy data showed the change of the spacing between the ν as (COO -) and ν s (COO -) absorption bands for the hybrid-ligand complexes as compared to that of the starting carboxylates can serve as an indication of the carboxylate anions character [8]. The higher values of ΔΔν(COO -) were typical of monodentate carboxylate anions; the smaller values characterized the bidentate or outer-sphere anions.…”

Synthesis and properties of potassium salts of per-O-carboxymethyl-calix[4]pyrogallols and their complexes with Cu2+, Fe3+, and La3+

“…All this reflects the difference in the frequencies ∆ν(CO 2 -) = ν as -ν s , which reaches the maxi mum value at monodentate coordination. 30, 45 However, the multifactor character and many carboxylate groups, whose absorption is overlapped, in the compounds under study do not allow us to conclude unambiguously about the coordination mode.…”