0000000001305951
AUTHOR
Paola Paoli
Zn2+ and Cu2+ complexes of a fluorescent scorpiand-type oxadiazole azamacrocyclic ligand: crystal structures, solution studies and optical properties
A ligand comprised of a macrocyclic pyridinophane core having a pendant arm containing a secondary amine group linked through a methylene spacer to a pyridyl–oxadiazole–phenyl (PyPD) fluorescent system has been prepared (L). The crystal structures of [ZnL](ClO4)2 and [CuL](ClO4)2 show that M2+ is coordinated to all the nitrogen atoms of the macrocyclic core, the secondary amine of the pendant arm and the nitrogen atom of the pyridine group of the fluorescent moiety, the latter bond being clearly weaker than the one with the pyridine of the macrocycle. Solution studies showed the formation of a highly stable Cu2+ complex with 1 : 1 stoichiometry, whereas with Zn2+ least stable complexes were…
Synthesis, crystal structure and magnetic properties of the first single azido-bridged copper(II) chain [Cu(bpym)(N3)2]n (bpym = 2,2′-bipyrimidine)
Abstract Single crystals of the copper(II) chain of formula [Cu(bpym) (N32]n (bpym = 2,2′-bipyrimidine) were prepared and characterized by X-ray diffraction methods. The structure consists of neutral chains of copper (II) ions bridged by a single azide group exhibiting the asymmetric end-to-end coordination mode. A terminally bound azide ligand and a didentate bpym group complete the square pyramidal geometry of the metal atom. The intrachain copper-copper separation is 5.063(1)A. The magnetic behaviour was investigated in the temperature range 2.0–290 K. The susceptibility curve exhibits a maximum at .9 K showing the occurrence of a weak intrachain antiferromagnetic coupling. Analysis of t…
Cation and Anion Coordination Chemistry of Palladium(II) with Polyazacycloalkanes. Thermodynamic and Structural Studies
The interaction of PdCI2 4 - with the macrocyclic ligands of the series [3k]aneNk has been studied both in solution and in the solid state. [18]aneN6 and [21]aneN7 form both mono- and binuclear Pd2+ complexes, whose stability constants have been determined in 0.5 mol dm-3 NaCI at 298.15 K. [21]aneN7 also forms, in solution, a trinuclear species in which an amino group deprotonates to bridge two Pd2+ ions, as observed in the solid state. The crystal structure of the complexes [Pd2([18]aneN6)Cl2][CIO4]2 and [Pd3[21]aneN7)CI3][CIO4]2 ⋅ H2O have been solved by single crystal X-ray analysis. C12H30N6CI4O8Pd2: monoclinic, space group C2/m, a = 10.876(2), b = 18.117(2), c = 7.043(2) A, s = 113.78(…
CCDC 1952561: Experimental Crystal Structure Determination
Related Article: Gianluca Ambrosi, M. Paz Clares, Isabel Pont, Mauro Formica, Vieri Fusi, Angela Ricci, Paola Paoli, Patrizia Rossi, Enrique García-España, Mario Inclán|2020|Dalton Trans.|49|1897|doi:10.1039/C9DT04764F
CCDC 1529591: Experimental Crystal Structure Determination
Related Article: Gianluca Ambrosi, M. Paz Clares, Isabel Pont, Mauro Formica, Vieri Fusi, Angela Ricci, Paola Paoli, Patrizia Rossi, Enrique García-España, Mario Inclán|2020|Dalton Trans.|49|1897|doi:10.1039/C9DT04764F