Structure of Diacetato bis (2,4,6 Trimethyl Pyridine) Copper(II)

Abstract

(2.4.6 trimethyl pyridine)2 Cu(CH3COO)2 has been obtained as violet needles by slow evaporation. The crystals belong to the monoclinic system, space group P21/C with two molecules in a unit cell of dimension: a = 7.842 (1), b = 16.384 (2), c = 8.320 (2) Å, β = 101.91 (1)°. The structure was solved by heavy atom method and refined by a least squares method (R = 0.029). The coordination of copper is 4 + 2. The atom arrangements of this structure is very near to the copper acetate one solvated by one water molecule and two 3.4 dimethyl pyridine molecules.

trans-Bis(acetato-O)bis(2-amino-6-methylpyridine-N)copper(II)

“…The stereochemistry of the title molecule is essentially four-coordinate with a CuN202 chromophore. Similar coordination was observed in some other monomeric copper acetates containing substituted pyridines with methyl groups on the 2,6-positions (Borel et al, 1981;Heimer & Ahmed, 1982;Busnot et al, 1983). In the present complex, the 2-amino-6-methylpyridine ligand is orientated in such a way that the amino group blocks further bonding from the Cu atom to the second carboxylate oxygen (02), but allows hydrogen bonding between the amino group and 02 [2.952 (3)~,].…”

“…In the present complex, the 2-amino-6-methylpyridine ligand is orientated in such a way that the amino group blocks further bonding from the Cu atom to the second carboxylate oxygen (02), but allows hydrogen bonding between the amino group and 02 [2.952 (3)~,]. The Cu---O2 distance of 2.764 (3)A is comparable with the value found in trans-diacetatobis(collidine)copper(II) [2.772 (Heimer & Ahmed, 1982) and 2.788 (3)A (Busnot et al, 1983)]; it is subs ot,oantially longer than the Cu--O1 distance of 1.952 (2)A but shorter than the sum of the van der Waals radii (2.80,~,), which indicates a weak interaction between the two atoms. Therefore, the (4+2) coordination is proposed.…”

“…Recently, the crystal structure, spectroscopic and magnetic studies of cis-bis(acetato-O)bis(2-aminopyridine-N)copper(II) were reported (Grobelny et al, 1995), in which the 2-aminopyridine ligands are arranged cis to each other. However, in monomeric complexes with a methyl group instead of an amino group in the ortho position, the trans arrangement was observed (Borel et al, 1981;Heimer & Ahmed, 1982;Busnot et al, 1983). The crystal structure of complex (I) was determined in order to find out how the ligands are arranged around the Cu atom and to compare the results with related structures.…”

Structure and stability of carboxylate complexes. XIX. The structures of diamminebis(glycolato)copper(II), tetraamminebis(ethoxyacetato)copper(II), bis(glycolato)bis(pyridine)copper(II) and bis(ethoxyacetato)bis(pyridine)copper(II)

“…References: (a) Morosin (1975); (b) Bernard, Borel, Busnot & Leclaire (1979); (c) this work; (d) Prout, Barrow & Rossotti (1971); (e) Knuuttila & Knuuttila (1983); 00 Greenaway, Pezeshk, Cordes, Noble & Sorenson (1984). * See Busnot, Busnot, Leclaire & Bernard (1983) and references therein for some methylpyridines. bis(methoxyacetato)bis(pyridine) compound (Table 5), although the Cu--N bond is significantly longer.…”

Electronic Structure Calculation and Crystal Structure of Trimethylpyridine Cobalt Chloride Complex

“…In Fig. 3 (Busnot et al, 1983). The electrons are divided into two types: a and b, according to their different spinning directions.…”