The author of 《Unraveling Concomitant Packing Polymorphism in Metallosupramolecular Polymers》 were Langenstroer, Anja; Kartha, Kalathil K.; Dorca, Yeray; Droste, Joern; Stepanenko, Vladimir; Albuquerque, Rodrigo Q.; Hansen, Michael Ryan; Sanchez, Luis; Fernandez, Gustavo. And the article was published in Journal of the American Chemical Society in 2019. Reference of 4-Iodopyridine The author mentioned the following in the article:
The phenomenon of polymorphism is ubiquitous in biol. systems and has been also observed in various types of self-assembled materials in solution and the solid state. In the field of supramol. polymers, different kinetic vs. thermodn. self-assembled species may exist in competition, a phenomenon termed as pathway complexity. In these examples, the transient kinetic species often has a very short lifetime and rapidly converts into the thermodn. product. The authors report a π-conjugated Pt(II) complex 1 that self-assembles in nonpolar medium into two supramol. polymers with distinct mol. packing (slipped (A) vs. pseudo-parallel (B)) that do not interconvert over time in a period of at least six months at room temperature Precise control of temperature, concentration and cooling rate enabled the authors to elucidate the stability conditions of both species through a phase diagram. Extensive exptl. studies and theor. calculations allowed the authors to elucidate the packing modes of both supramol. polymorphs A and B, which are stabilized by unconventional N-H···Cl-Pt and N-H···O-alkyl interactions, resp. Under a controlled set of conditions of cooling rate and concentration, both polymorphs can be isolated concomitantly in the same solution without interconversion. Only if A is annealed at high temperature for prolonged time, a slow transformation into B takes place via monomer formation. The authors’ system, which in many respects bears close resemblance to concomitant packing polymorphism in crystals, should help bridge the gap between crystal engineering and supramol. polymerization In the experimental materials used by the author, we found 4-Iodopyridine(cas: 15854-87-2Reference of 4-Iodopyridine)
4-Iodopyridine(cas: 15854-87-2) is used as a reagent in the synthesis of indazolylamides as glucocorticoid receptor agonists. 4-Iodopyridine is a halogenated heterocycle that is a building block for proteomics research.Reference of 4-Iodopyridine
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com