UCHEM is main supplier of series of symmetric/ unsymmetric substituted 2,2'-bipyridine, 1,10-phenanthroline and 2,2':6',2"-terpyridine derivatives in the world. Most of them are available from warehouse. Some of them have been supplying from kilograms to commcercial size.
The following are analogues derived from terpyridine:
[2,2':6',2"-Terpyridine]-4,4',4"-triyltrimethanol CAS: 1309964-61-1