Synthesis of Oligodiacetylene Derivatives from Flexible Porous Coordination Frameworks

Oligodiacetylenes
(ODAs) with alternating ene–yne conjugated
structure are significant materials for optical and electronic properties.
Due to the low solubility of ODAs in common solvents, the synthetic
approaches are limited. Here we disclose a new synthetic approach
of ODAs without a side alkyl chain using a porous coordination polymer
(PCP) as a sacrificial template. 1,2-Bis­(4-pyridyl)­butadiyne, which
works as a monomer, was embedded in the flexible framework of the
PCP, and ODAs were synthesized via utilization of the anisotropic
thermal expansion of the PCP crystal. The oligomeric state of ODAs
depends on the metal ion and coligand of the precursor.