Structural Transformation of Surface-Confined Porphyrin Networks by Addition of Co Atoms

The self‐assembly of a nickel‐porphyrin derivative (Ni‐DPPyP) containing two pyridyl coordinating sites and two pentyl chains at trans meso positions was studied with scanning tunneling microscopy (STM), X‐ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED) on Au(111). Deposition of Ni‐DPPyP onto Au(111) gave rise to a close‐packed network for coverages smaller or equal to one monolayer as revealed by STM and LEED. The molecular arrangement of this two‐dimensional network is stabilized via hydrogen bonds formed between the pyridyl's nitrogen and hydrogen atoms from the pyrrole groups of neighboring molecules. Subsequent deposition of cobalt atoms onto the close‐packed network and post‐deposition annealing at 423 K led to the formation of a Co‐coordinated hexagonal porous network. As confirmed by XPS measurements, the porous network is stabilized by metal‐ligand interactions between one cobalt atom and three pyridyl ligands, each pyridyl ligand coming from a different Ni‐DPPyP molecule

Design of Coordination Polymers based on combinations of 1,2-diphenylethane-1,2-diyl diisonicotinate with Cu(II), Zn(II), Cd(II) and Co(II)

International audienceFive new supramolecular coordination polymers (L-Cu(acac)2, L-Cu(hfac)2, L-ZnCl2, L-CdI2 and L-CoCl2) based on the use of the flexible organic ligand L (1,2-Diphenylethane-1,2-diyl diisonicotinate) combined with Cu(acac)2, Cu(hfac)2, ZnCl2, CdI2 or CoCl2 metallaligands, were synthesized and structurally characterized by single-crystal X-ray diffraction. They represent the first reported coordination polymers based on this ligand presenting ether junctions. X-ray diffraction analysis revealed the structure and the dimensionality of these coordination polymers as well as their packing in the crystal that depends on the conformation adopted by the ligand L and the nature of the metallic salt

Bis-β-cyclodextrinyl- and bis-cellobiosyl-diazacrowns: synthesis and molecular complexation behaviors toward Busulfan anticancer agent and two basic aminoacids

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