Network diversity and supramolecular isomerism in copper(II)/1,2-bis(4-pyridyl)ethane coordination polymers

• Published in: Polyhedron Vol. 30; no. 6; pp. 963 - 970
• Main Authors: Lazarou, Katerina N., Psycharis, Vassilis, Terzis, Aris, Raptopoulou, Catherine P.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 13-04-2011
• Subjects: 1,2-Bis(4-pyridyl)ethane; Coordination polymers; Copper(II) complexes; Supramolecular isomerism; Coordination polymers; 1,2-Bis(4-pyridyl)ethane; Supramolecular isomerism; Copper(II) complexes
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2010.12.030

The use of 1,2-bis(4-pyridyl)ethane (bpe) in copper(II) chemistry has led to coordination polymers with diverse topologies and chemical compositions, i.e. the supramolecular isomers 1D [Cu(bpe)
2(dmf)
2]
n
(ClO
4)
2
n
·2
ndmf (
1·2
ndmf) and 2D (4,4) weave-like sheets [Cu(bpe)
2(dmf)
2]
n
(ClO
4)
2
n
·3.5
ndmf (
2·3.5
ndmf) as well as 3D inclined interpenetrating (4,4) sheets [Cu(bpe)
2(NO
3)
2]
n
·2
nH
2O (
4·2
nH
2O) and cross-linked 1D [Cu
2(bpe)(O
2CMe)
4]
n
·0.7
nH
2O (
5·0.7
nH
2O) have been prepared and structurally characterized.
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► Conformational isomer’s influence on network dimensionality and diversity. ► Anion and solvent dependent network dimensionality and structural topology. ► New multi-dimensional meta-organic networks of flexible pyridine derivatives.
Reactions of copper(II) sources with 1,2-bis(4-pyridyl)ethane (bpe) yielded metal–organic networks with diverse topologies and dimensionalities. Compounds [Cu(bpe)
2(dmf)
2]
n
(ClO
4)
2
n
·2
ndmf (
1·2
ndmf), [Cu(bpe)
2(dmf)
2]
n
(ClO
4)
2
n
·3.5
ndmf (
2·3.5
ndmf), [Cu(bpe)
2(NO
3)
2]
n
·2
nH
2O (
4·2
nH
2O) and [Cu
2(bpe)(O
2CMe)
4]
n
·0.7
nH
2O (
5·0.7
nH
2O) have been isolated by altering the copper(II) source, the reaction solvent and the crystallization process. Compounds
1·2
ndmf and
2·3.5
ndmf consist of cationic [Cu(bpe)
2(dmf)
2]
2+ repeating units assembled to 1D and 2D (4,4) networks, respectively, and represent supramolecular isomers due to the conformational isomerism of the bridging bpe molecules. Compound
4·2
nH
2O consists of neutral mononuclear [Cu(dpe)
2(NO
3)
2] repeating units assembled to inclined interpenetrating (4,4) sheets describing an overall entanglement that is 3D in nature, and compound
5·0.7
nH
2O consists of neutral dinuclear repeating units assembled to cross-linked 1D chains.