Multi-domain hydrogen-bond forming metal chelates: X-ray crystal structures of dicyclopalladated 2,3-bis[6-(2-amino-4-phenylamino-1,3,5-triazinyl)]pyrazine (H(2)L) [Pd(2)Br(2)L] and 2,6-bis[6-(2-amino-4-phenylamino-1,3,5-triazinylium)]pyridine dichloride

Two new multi-domain alpha-diimine ligands capable of tri-hydrogen-bonding interactions are described; the non-planar dicyclopalladated complex [Pd(2)Br(2)L] 3a (X = Br) has imposed chirality and contains a short non-bonded 1,6-N ... N' contact of 2.75 Angstrom; the cationic (2a) form of the pseudo-terpyridine molecule 2 has a virtually planar central core and is shown to be a potential host material.