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Introduction Of Copper Acetate Structure
Adaugat pe 09/01/2020 03:04:52 de weishida

Copper
Acetate
 (II)
acetate monohydrate, and similar Rh (II) and Cr (II) tetraacetates all adopt a
"Chinese lantern" structure. One oxygen atom of each acetate is bonded to one
copper atom, the Cu-O bond length is 197pm; two water molecule ligands occupy
the upper and lower, and the Cu-O bond length is 220pm. The distance between two
five-coordinated copper atoms is 265pm, which is close to the Cu-Cu distance
(255pm) in metallic copper. This Cu2 (OAc) 4 (H2O) 2 dimer unit structure is
mainly bonded by hydrogen bonding in the crystal. Other small molecular ligands
such as dioxane, pyridine and aniline can replace the water in the dimer.
molecule.


The
two copper atoms interact with each other. At room temperature, the magnetic
moment is 1.40BM, but it decreases with decreasing temperature (such as 0.36BM
at 93K). At 253K, the magnetic susceptibility exhibits a maximum value, which is
calculated from the adjacent The exchange between copper atoms is 286 cm-1,
indicating that the copper atoms in the dimer are bonded by a weak covalent
bond. Due to the opposite cancellation of the spin directions, Cu2 (OAc) 4 (H2O)
2 is essentially antimagnetic, and this structure has made an important
contribution to the development of modern antiferromagnetic coupling
theory.

Tag-uri: Copper Acetate





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