The infrared spectra (3500-140 cm?1) of the 2,2'-bipyridine, 2-aminomethylpyridine and ethylenediamine adducts and the sodium tris-compounds of cobalt(II), nickel(II) and zinc(II) acetylacetonates

Abstract

The M(acac)2B and NaM(acac) 3 complexes (M = Co If, Ni II orZnll; acac = acetylacetonate anion; B = 2,2'-bipyridine, 2-aminomethylpyridine or ethylenediamine) have been prepared and their i.r. spectra determined over the 3500-140 cm -l range. Complete band assignments have been made on a comparative basis, with the effects of ligand substitution and metal ion substitution being considered. Bands in the i.r. spectra of the complexes which are associated with 2,2'-bipyridine, 2-aminomethylpyridine and ethylenediamine are in excellent agreement with values previously established for these ligand and metal-ligand vibrations, in related complexes. Band assignments for acetylacetonate anion and metal-acetylacetonate vibrations substantiate those made in certain of the previously published papers. The method of assignment adopted has allowed the complete assignment of bands in the i.r. spectra of the metal complexes.

Metal acetylacetonate–amine and metal nitrate–amine complexes as low‐emission catalysts for rigid polyurethane foam preparation

“…The λ max of Zn(acac) 2 (en) in UV spectrum is similar to that of Zn(acac) 2 . Both IR and elemental analysis data agreed with the previous work . In addition, MALDI‐TOF mass spectrometry data of Zn(acac) 2 (en) show the peak of [Zn(acac) 2 (en)] + at m / z = 323.05, which indicate that its molecular formula is Zn(acac) 2 (en).…”

“…Zinc(II) acetylacetonate (0.687 g, 2.60 mmol), ethylenediamine (0.35 mL, 5.20 mmol), and methanol (25 mL) were used in the synthesis. Zn(acac) 2 (en) was isolated by filtration, washed with methanol, and dried in vacuo . Zn(acac) 2 (en) was obtained as a white powder (0.791 g, 79%): IR (KBr): ν = 3318 (m; NH), 2972 (w; CH), 1602 (s; ν as CO), 1507 (s; ν s CO), 1320 (m; CN), 1124 cm −1 (m; CO); UV–vis (MeOH); λ max (ε) = 288 nm (980); MS (MALDI‐TOF, m / z ): [Zn(acac) 2 (en)] + calcd for ZnC 12 H 22 N 2 O 4 , 323.70; found, 323.05; Anal.…”

Nickel(II)⋯π interaction in [M(ampy)2Ni(μ-CN)2(CN)2]n (M=Zn(II) and Cd(II), ampy=2-aminomethylpyridine): Syntheses, vibrational spectroscopy, thermal analyses and crystal structures of cyano-bridged heteronuclear polymeric complexes

“…1. The tentative assignments and the wavenumbers of the infrared bands of the ampy ligand and Ni(CN) 4 ion observed in the FT-IR spectra of the complexes are given in (Tables 1a and 1b), together with the wavenumbers for ampy molecule in the liquid phase [22,23] and Na 2 [Ni(CN) 4 ] in the solid state [24], respectively. A glance at Table 1a shows that the ampy ligand shows infrared bands in the 3366-3188 cm À1 range are assigned to the m(N-H) symmetric and antisymmetric stretching frequencies.…”

Two dimensional heteronuclear complexes with cyanide and 4-aminomethylpyridine ligands

“…1, the presence of bands belonging to the ligand in the FT-IR and Raman spectra of the complexes shows the existence of ampy in the complexes. The wavenumbers of ampy observed in the FT-IR and Raman spectra of the complexes are given in Table 1, together with vibrational data of free ampy [50]. The asymmetric and symmetric m(NH 3 ) stretching and d(NH 3 ) degenerate deformation vibrations appear in the regions of 3400-3000 and 1650-1550 cm À1 , respectively.…”

“…Assignment [50] ampy 1 2 Eos CCD detector) diffractometer, for 1 and 2, respectively. On the Bruker diffractometer, Bruker APEX2 [42] and Bruker SAINT v7.53A software programs were used; for data collection and data reduction, respectively [43].…”