Assembly molecular architectures based on structural variation of metalloligand [Cu(PySal)2] (PySal = 3-pyridylmethylsalicylideneimino)

A versatile neutral metalloligand [Cu(PySal)2] (1) (PySal = 3-pyridylmethylsalicylidene-imino) was exploited as a building unit to construct five complexes {Cu[Cu(PySal)2]2}(ClO4)2 (2), {Cd[Cu(PySal)2]2(H2O)2]} (NO3)2 · 2H2O · 4CH3OH (3), {Zn[μ2-Cu(PySal)2]Cl2}n · nCH3OH (4), {Hg[μ2-Cu(PySal)2]I2}n (5) and {Cd[μ2-Cu(PySal)2]Cl2}n · nCH2Cl2 (6). [Cu(PySal)2] acts as a chelating ligand in discrete complexes 2 and 3 with unbound anions, but as a bis-monodentate bridging ligand in polymers 4, 5 and 6 when halogen anions coordinated cooperatively to metal cations. The coordination geometry of Cu2+ is well-defined square planar in bridging [Cu(PySal)2], analogous to that in free metalloligand (1), but it is distorted square planar in chelating [Cu(PySal)2].

Graphical abstractA metalloligand of [Cu(PySal)2] (1) (PySal = 3-pyridylmethylsalicylideneimino) with structural versatility was exploited as a building unit to construct diverse structures in five complexes {Cu[Cu(PySal)2]2}(ClO4)2 (2), {Cd[Cu(PySal)2]2(H2O)2]}(NO3)2 · 2H2O · 4CH3OH (3), {Zn[Cu(PySal)2]Cl2}n · nCH3OH (4), {Hg[Cu(PySal)2]I2}n (5) and {Cd[Cu(PySal)2]Cl2}n · nCH2Cl2 (6).Figure optionsDownload full-size imageDownload as PowerPoint slide