“…1) with many branches suggests that G2 molecules assemble by a different manner from G1. Carrying both donor and acceptor groups, G2 molecules are able to connect with each other via single hydrogen bond between pyridyl and carboxyl groups [26], such connection is proved from the IR spectrum mentioned later. Because the substitute group locates at 3-position of pyridine ring, each time of molecular connection should make the chain end pointing to a different direction from the last one, therefore resulting in somewhat zigzag chain.…”