Synthesis and crystal structure of two novel PbII compounds of [Pb(endc)2(phen)]n and [Pb(endc)(phen) · 3H2O]2

[Pb(endc)2(phen)]n is a nine-coordinated catenulate-like polymer, and [Pb(endc)(phen) · 3H2O]2 is a hepta-coordinated dimer; both of them hold hemidirected coordination geometries. To the best of our knowledge, [Pb(endc)2(phen)]n is the first hemidirected PbII coordinate with the coordination number of 9. For both compounds, the Pb-N, Pb-O(carboxyl) and Pb-O(carbonyl) bonds on the side away from lone pair of PbII are shorter than the rest of the same type, respectively; and these bonds become progressively longer, as they are arranged at the site nearer to the lone pair.