Cobalt(II) complexes of the 2-aminopicolineN-oxides and 2-amino-4, 6-lutidineN-oxide

Thermochemistry of 3-Cyanopyridine Adducts of Some Bivalent Transition Metal Bromides

“…The ligand field parameters for the cobalt(II) adduct have been calculating according to Lever. 16 Considering the number and position of the bands 17,18 and according to the magnitude of the crystal field parameters as compared with that of Bolster, 19 it is concluded that four nitrogen atoms from four ligand molecules and two bromide ions form a pseudo-octahedral around the Co(II) ion. The ligand field parameters for the nickel(II) adduct were calculated according to Reedijk et al 20 and Lever.…”

Thermochemistry of Morpholine Adducts of Some Bivalent Transition Metal Bromides

“…This indicates the coordination of the ligand to the metallic ion. − The positive shift of the C−O−C stretching vibration that is found at 1097 cm −1 in the free ligand excludes the possibility of oxygen-to-metallic ion coordination . In the H−N−C deformation region, a great change is observed that affords evidence of the coordination of the N atom of the ligand. , The metal−nitrogen and metal−bromide stretching modes in the low frequency IR region are assigned. ,, Table presents the extracted infrared spectral data of the adducts.…”

“…Table contains the band maxima assignments and calculated ligand parameters for the adducts. − The adducts of Mn(II), Fe(II), Co(II), and Cu(II) are pseudo-octahedral with two nitrogen atoms from two ligand molecules and four bromide ions surrounding each metal ion in a polymeric structure of bridging bromide ions (Figure ). The adduct of Ni(II) is pseudo-octahedral with three nitrogen atoms from three ligand molecules and three bromide ions surrounding each nickel ion in a dimeric structure of bridging bromide ions − (Figure ).…”

“…13,14 The metal-nitrogen and metal-bromide stretching modes in the low frequency IR region are assigned. 1,15,16 Table 2 presents the extracted infrared spectral data of the adducts.…”

“…H θ /kJ • mol -1 ) -196.47 ( 2 16. ∆ 1 H θ /kJ • mol -1 ) -56.55 ( 1.39[NiBr 2 (morph) 3 ] (s) + 1.2 M HCl of tris(hydroxymethylamino) methane in 0.1 mol • dm -3 hydrochloric acid.…”