Crystal structure of bis[N-(2-aminopropyl)-salicylaldiminato)]cobalt(III) perchlorate, C20H26ClCoN4O6

Abstract

Source of materialReagents and solvents used were of commercially available quality. The Schiff's base ligand (L) was prepared by the (1 + 1) condensation of salicylaldehyde with 1,2-diaminopropane in methanol at room temperature. Further isolation was not carried out and the ligand solution was subsequently used for the preparation of the metal complexes. To a methanol solution (5 ml) of CoCl 2 · 6H2O (238 mg, 1 mmol) was added a methanol solution (5 ml) of L (2 mmol) with stirring for 30 min. NaClO 4 (100 mg) in methanol (2 ml) was added to the above solution. Upon slow diffusion of diethyl ether into the resulting dark purple solution for four days, large dark purple prismatic crystals of the title complex were deposited and collected by filtration, respectively washed with methanol and diethyl ether and dried in a vacuum desiccator over silica gel (yield 83%).

Crystal structure of acetato-μ-N,N′-bis(salicylidene)-3-methyl- 3-aza-1,5-pentanediaminocobalt(III), Co(C2H3O2)(C21H25N3O2)

“…Many cobalt(II,III) complexes were prepared and structurally determined by single X-ray analysis [1][2][3][4][5][6][7]. Especially, complexes with various Schiff bases are a hot branch of cobalt chemistry [1,2,4,6,7].…”

Crystal structure of tetra(2-aminopyrimidine)dimethanolato-dicobalt(II) diperchlorate, [Co2(CH3O)2(C4H5N3)4][ClO4]2

“…Recently, there were many cobalt(II, III) complexes being structurally determined by single X-ray analysis [1][2][3][4]. We have been interested in preparing some mono-, di-or trinuclear metal complexes and assaying their biological relevant activities and succeeded in preparing the trinuclear cobalt complexes [5].…”

When the Metal Makes the Difference: Template Syntheses of Tridentate and Tetradentate Salen-Type Schiff Base Ligands and Related Complexes

“…Other metal ions that favor an octahedral coordination, such as iron(III) [107][108][109][110], chromium(III) [111][112][113][114][115][116][117], and cobalt(III) [44,85,[116][117][118][119][120][121][122][123][124][125][126], are known to show a reactivity for obtaining [M( G L) 2 ](X) species with various X − anions, similarly to nickel(II). Differently from before, these metals allow to obtaining N 2 O tridentate Schiff base ligands with diamines bearing two carbon atoms connecting the amine groups (en, pn, etc.…”

“…The general procedure involves the reaction of G-salH, diamine, cobalt(II) salt (usually acetate, chloride, perchlorate, and tetrafluoroborate) and the sodium salt of the desired final X  (N3  , ClO4  , NCS  , I  ) in refluxing methanol or ethanol, Equation (9). Several G groups are tolerated (H [116][117][118][119], 5-NO2 and 3,5-diNO2 [125], 5-Cl [85], 4-COOH [123], 6-diazonaphthalene-1,3-disulfonic acid disodium salt The template effect of chromium(III) has been exploited with two different approaches, one by reacting the precursor [Cr(H-sal) 3 ] with en or pn, similarly to nickel(II) [37], and addition of the sodium salt with anions such as I − , Br − , ClO 4 − , and NO 3 − [112,117], Equation (8a), and the second by hydrolytic conversion of H 2 salen in the presence of [Cr(urea) 6 ](Cl) 3 •2H 2 O [115], Equation (8b). The crystal structures of several [Cr( H L) 2 ](X) compounds are reported from en [111,113,115] or pn [114,116] and different anion X − (I − [111,113], ClO 4 − [114,116], Cl − [115]).…”

“…The general procedure involves the reaction of G-salH, diamine, cobalt(II) salt (usually acetate, chloride, perchlorate, and tetrafluoroborate) and the sodium salt of the desired final X − (N 3 − , ClO 4 − , NCS − , I − ) in refluxing methanol or ethanol, Equation (9). Several G groups are tolerated (H [116][117][118][119], 5-NO 2 and 3,5-diNO 2 [125], 5-Cl [85], 4-COOH [123], 6-diazonaphthalene-1,3-disulfonic acid disodium salt [120], 3-OMe [126]), as well as different diamines (en [85,117,120], pn [116,118,119], chxn and dpen [44], tn [123,124,126]). Not all reported cases are template synthesis, and previous isolation of the half units are also reported, even if sometimes in mixture with the salen-type ligands and used without further purification [44,119,122].…”