Synthetic Route of C12H10Cl2N2On September 19, 2000 ,《Synthesis of Thermochromic Iron(II) Tris(bipyridine)-Centered Star-Shaped Polyoxazolines and Their Bipyridine-Centered Macroligand Counterparts》 was published in Macromolecules. The article was written by McAlvin, John E.; Scott, Sarah B.; Fraser, Cassandra L.. The article contains the following contents:
Iron tris(bipyridine) complexes [Fe{4,4′-bis(chloromethyl)-2,2′-bipyridine}3], I, and the corresponding iodide analog generated in situ using NaI, II, were used as initiators for the polymerization of a series of 2-R-2-oxazoline monomers (R = Et, EtOX; Me, MeOX; Ph, PhOX; and undecyl, UnOX). The resulting labile core, red-violet Fe-centered star polymers fragment during mol. weight anal. by gel permeation chromatog. (GPC). Thus, samples were subjected to chem. cleavage in aqueous K2CO3 to generate metal-free bipyridine-centered polyoxazolines, bpyPROX2. When combined with ferrous ammonium sulfate, these bpyPROX2 macroligands chelate to Fe(II), regenerating the [Fe(bipyridine)3]2+ chromophores. Both preparative and anal. kinetics experiments generally produce polymers with reasonably narrow mol. weight distribution (∼1.1 – 1.5). Mol. weight vs. percent monomer conversion plots with either the iodide or chloride initiating system were nearly linear for all monomers ; however, only PEOX and PUOX products show good correlation with Mn(calculated) based on monomer/initiator loading. For most monomers, reactions with iodide initiators are faster than the chlorides, and linear first-order kinetics plots were observed Polymerization of oxazolines with 4,4′-bis(halomethyl)-2,2′-bipyridines produced polymers with narrow mol. weight distribution but with mol. weight higher than targeted based on monomer loading. The 1H NMR data indicate that termination with dipropylamine is efficient for EtOX polymerizations Thermal anal. by DSC and TGA reveal few differences between Fe-centered stars and their bpy-centered PROX macroligand counterparts. Variable-temperature UV/vis data of Fe-centered PEOX thin film illustrate the bleaching of the metal to ligand charge transfer band at about 535 nm of an Fe-centered PEOX film heated under N; cooling and reheating revealed that this process is at least partially reversible for all [Fe-(bpyPROX2)3]2+. In the experiment, the researchers used 4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4Synthetic Route of C12H10Cl2N2)
4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. Synthetic Route of C12H10Cl2N2 Pyridine has a conjugated system of six π electrons that are delocalized over the ring.