Metal complexes of saccharin

Three transition metal complexes formed with tripodal polyimidazole ligands: synthesis, crystal structures and reactivity toward superoxide

Bis(saccharinato)palladium(II) and platinum(II) complexes with 2,2′-bipyridine: Syntheses, structures, spectroscopic, fluorescent and thermal properties

A range of N-donor ligands based on the 1H-pyridin-(2E)-ylidene (PYE) motif have been prepared, including achiral and chiral examples. The ligands incorporate one to three PYE groups that coordinate to a metal through the exocyclic nitrogen atom of each PYE moiety, and the resulting metal complexes have been characterised by methods including single-crystal X-ray diffraction and NMR spectroscopy to examine metal-ligand bonding and ligand dynamics. Upon coordination of a PYE ligand to a proton or metal-complex fragment, the solid-state structures, NMR spectroscopy and DFT studies indicate that charge redistribution occurs within the PYE heterocyclic ring to give a contribution from a pyridinium-amido-type resonance structure. Additional IR spectroscopy and computational studies suggest that PYE ligands are strong donor ligands. NMR spectroscopy shows that for metal complexes there is restricted motion about the exocyclic C-N bond, which projects the heterocyclic N-substituent in the vicinity of the metal atom causing restricted motion in chelating-ligand derivatives. Solid-state structures and DFT calculations also show significant steric congestion and secondary metal-ligand interactions between the metal and ligand C-H bonds.

Synthesis, coordination chemistry and bonding of strong N-donor ligands incorporating the 1H-pyridin-(2E)-ylidene (PYE) motif.

Structural studies of Ni(II), Zn(II) and Cd(II) complexes with saccharinate and 2,2′-bipyridine ligands

X-ray crystal structure and spectral study of [Cu(C10H8N2)2(C6H4COSO2N)]· (C6H4COSO2N)·3H2O

A New Extended Tetranuclear Titanium Cluster: Ti4O(Te2)4TeI4

Some copper(I) and copper(II) complexes of two new potentially heptadentate tripodal Schiff base ligands

/pdf/synthesis-and-crystal-structure-of-a-new-metal-rich-layered-eznsa14mrb.pdf

Synthesis and Crystal Structure of a New Metal-rich Layered Ternary Tantalum Telluride TaNi 2 Te 2

The title complex crystalizes in the space group P1 with a = 1.3349(7), b=1.9790(4), c= 1.2784 (7) nm, α = 97.67(1). β = 10636(1), γ=91.71(1)° ,Z = 2, Mr= 1475.19 and the final R = 0.051. Each asymmetric species in the crystal contains two crystallographically different Eu (p-CH3C6H4COO)3(C12H8N2) units. Two types of bmuclear molecules are formed by the combination of each of the units through inversion with corresponding units of (he closest asymmetric species. The former contains 4 bridged carboxylate groups bonded to the two central europium (III) ions, and the latter, only 2 bridged carboxylate anions Their Eu-Eu atomic distances are 0.4203 and 0.5298 nm respectively. In the 7F0→ 5D0, excitation spectrum of the complex, there are two sharp peaks al 580.07 and 580.73nm. This shows that the complex has two Eu(III) sites. Two different sets of 5D0→Fj (j= 1 - 4) luminescence spectra have been obtained at the selectively excited 5D0 levels of the complex, which indicates that Eu(III) ions in the complex have unequally chemical environments. This is in agreement with the results of the structure determination.

Liu Shixiong

Papers

X-ray crystal structure and spectral study of [Cu(C10H8N2)2(C6H4COSO2N)]· (C6H4COSO2N)·3H2O

A New Extended Tetranuclear Titanium Cluster: Ti4O(Te2)4TeI4

Some copper(I) and copper(II) complexes of two new potentially heptadentate tripodal Schiff base ligands

Synthesis and Crystal Structure of a New Metal-rich Layered Ternary Tantalum Telluride TaNi 2 Te 2

Crystal structure and luminescence spectra of Eu 2 ( p -MAB) 6 (PHEN) 2 complex