Citation: Xing-Qiang L\"u; Ji-Jun Jiang; Hans-Conrad zur Loye; Bei-Sheng Kang; Cheng-Yong Su (2005). A Noninterpenetrated 1D Molecular Ladder and 2D Butterfly Network: Effect of Positional Isomerism of Semirigid Bis(pyridylmethyl)pyromellitic Diimide Ligands on the Architecture of Their Metal(II) Complexes . Inorganic Chemistry, 44, pp. 1810-1817.