Copper(II) Acetate/Bis(4-pyridylthio)methane System: Synthesis, Structural Diversity, and Single-Crystal to Single-Crystal Transformation
journal contribution
posted on 2014-06-04, 00:00 authored by Ana Belén Lago, Rosa Carballo, Sabina Rodríguez-Hermida, Ezequiel M. Vázquez-LópezFour new coordination compounds have
been obtained by the reaction
of copper(II) acetate with SCS [bis(4-pyridylthio)methane], namely,
[Cu<sub>2</sub>(AcO)<sub>4</sub>(SCS)] (<b>1</b>), [Cu<sub>2</sub>(AcO)<sub>4</sub>(SCS)]·solv (<b>2</b>), [Cu<sub>4</sub>(AcO)<sub>8</sub>(SCS)<sub>5</sub>(H<sub>2</sub>O)<sub>6</sub>]·4H<sub>2</sub>O (<b>3</b>), and [Cu<sub>4</sub>(OH)<sub>2</sub>(AcO)<sub>6</sub>(SCS)<sub>2</sub>]·10H<sub>2</sub>O (<b>4</b>).
Structural diversity is achieved by the copper acetate moiety in combination
with the flexibility of the SCS ligand. X-ray structural analysis
revealed that the compounds have different structural motifs: linear
chains in <b>1</b>, zigzag chains in <b>2</b>, undulated
tetramers in <b>3</b>, and ladder-like chains in <b>4</b>. The structures are further connected through hydrogen-bonding interactions
with trapped solvent molecules in the crystal lattices (<b>2</b>–<b>4</b>). Guest molecules have a decisive influence
on the final crystal system for <b>2</b>–<b>4</b>. Compound <b>2</b> exhibits a temperature-induced single-crystal
to single-crystal (SC–SC) transformation, and phase transitions
from <b>2</b> and <b>3</b> to <b>1</b> have been
found in an irreversible desolvation or recrystallization process.
