Studies have been carried out on two solvent-dependent structures of Co(NO 3 ) 2 with trans-1,2-bis(4-pyridyl)ethylene (bpee) and their interconversions. X-ray analyses disclose that the molecule obtained in MeOH/CHCl 3 is an infinite ladder structure, [Co(NO 3 ) 2 (bpee) 1.5 ‚3CHCl 3 ] n (triclinic P1 h; a ) 10.415(4) Å, b ) 13.425(4) Å, cFor [Co(NO 3 ) 2 (bpee) 1.5 ‚ 3CHCl 3 ] n , the local geometry around the cobalt(II) atom approximates to a heptacoordinate environment with four oxygens and three nitrogens. The four oxygen sites are occupied by an isobidentate and an anisobidetate nitrate ligand. Each bpee spacer connects two cobalt(II) atoms defining a T-shaped arrangement at the metal atom. For [Co(H 2 O) 4 (bpee) 2 ](NO 3 ) 2 ‚ 8 / 3 H 2 O‚ 2 / 3 bpee, the cobalt atom is in a typical octahedral arrangement with two bpee ligands and four water molecules. The bpee ligand is coordinated to the cobalt atom in a monodentate mode with a dangling pyridine group. Thermal and IR analyses of the present two complexes show that in the solid state the mononuclear complex is changed to the ladder structure at temperatures above 150 °C. Moreover, the ladder structure slowly shifts to the mononuclear complexes at sufficient moisture condition. Thus, either the ladder structure or the mononuclear complex exists depending on the presence or absence of moisture.
A study of striking
structural differences in the magic angle of Py2S and
coligand effects has been carried out.
[Co(Py2S)2Cl2]
n
is the first integral two-layer interwoven sheet without any counterion
or solvate whereas
[Co(Py2S)2(NCS)2]
n
affords a double-stranded linear infinite structure. Thermal
analyses of the complexes over the temperature range 25−430 °C show
the significant thermal behaviors associated with the
structure.
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