A novel three-dimensional coordination polymer involving Pb-Pb interactions and three different hemidirected lead(II) coordination spheres: X-ray crystal structure of tris(1,10-phenanthroline-kappa N-1,kappa N-10)-bis[{mu(3)-[5-(sulfo-kappa O)benzene-1,3-dicarboxylate(3-)-kappa O-1,kappa O-1 ': kappa O-2,kappa O-2 ':kappa O-2]}trilead (Pb-Pb) trihydrate ([Pb-3(phen)(3)(H2O)(2)(sip)(2)](n) center dot 3 H2O)