Multinuclear Cu(I) Clusters Featuring a New Triply Bridging Coordination Mode of Phosphaamidinate Ligands

Phosphabenzamidine [mes-NH-C(Ph)═P-mes) (1) and phosphaformamidine (mes-NH-CH═P-mes) (4) ligands have been synthesized and characterized. The conjugate bases of 1 and 4 coordinate by each bridging three Cu(I) ions, forming hexa- and tetranuclear clusters Cu₆[mes-N═C(Ph)-P-mes]₃Cl₄Li(THF)₂ (3) and Cu₄[mes-N═CH-P-mes]₄ (5), respectively. Both clusters have been fully characterized using ¹H NMR, ³¹P NMR, and X-ray crystallography. Complexes 3 and 5 exhibit a previously unknown coordination mode of phosphaamidinates, which are far less studied than their well-known amidinate counterparts.

Thiacalix[4]arene-supported heterodinuclear NiII–LnIII complexes: slow magnetic relaxation behavior in the dysprosium analogue

Three thiacalix[4]arene-supported ferromagnetic Ni^II–Ln^III complexes have been isolated. The dysprosium analogue exhibits field-induced SMM behavior and diamagnetic dilution can efficiently influence the dipole–dipole interaction between magnetic centers.

Ethyleneglycol tungsten complexes of calix[6 and 8]arenes: synthesis, characterization and ROP of ε-caprolactone

Ethylene glycolate tungsten complexes bearing calix[n]arene ligands (n = 6, 8) have been structurally characterized and exhibit catalytic activity for the ROP of ε-caprolactone in the presence of benzyl alcohol.