From Molecular Design to Supramolecular Design: Synthesis and Size-Selective Coordination Chemistry of 1,2-Bis(2'-pyrazineethynyl) Benzene
The synthesis and coordination chemistry of 1,2-bis(2‘-pyrazineethynyl)benzene are presented. With four Lewis base sites, the ligand may adopt a conformation in which two nitrogen atoms face inward and two nitrogens face out. In this conformation, it may complex transition metal cations either "internally" or "externally". An "internal" 1:1 complex is formed with silver(I) nitrate, while the larger dicopper(II) tetraacetate moiety does not fit in the internal cavity and is thus externally coordinated by two separate ligands as a 2:2 coordination complex. When mixed with 1 equiv each of silver(I) cation and copper(II) acetate the ligand selectively complexes the cations and a coordination complex with two "internally coordinated" silver(I) cations and an "externally coordinated" dimeric copper(II) acetate moiety is obtained. Self-assembly with 1 equiv of silver(I) nitrate and 2 equiv of copper(II) acetate results in the formation of a mixed-metal coordination polymer with alternating silver and copper centers. In the presence of an excess of silver(I) cations, an infinite one-dimensional coordination polymer is formed with one "internal" and one "external" silver(I) cation.
conformation, organic compounds, anions, ligands, cations
Schultheiss, Nate, Charles L. Barnes, and Eric Bosch. "From Molecular Design to Supramolecular Design: Synthesis and Size-Selective Coordination Chemistry of 1, 2-Bis (2 ‘-pyrazineethynyl) Benzene." Crystal growth & design 3, no. 4 (2003): 573-580.
Crystal growth & design