A new C-anionic tripodal ligand 2-{bis(benzothiazolyl)(methoxy)methyl}phenyl and its bismuth complexes

Abstract

A new tripodal C-anionic ligand, 2-{bis(benzothiazolyl)(methoxy)methyl}phenyl (L), was stably generated by the reaction of the ligand precursor (L′), the corresponding bromide (2-BrC₆H₄)(MeO)C(C₇H₄NS)₂ (C₇H₄NS = 2-benzothiazolyl), with nBuLi at −104 °C in the presence of TMEDA (N,N,N′,N′-tetramethylethylenediamine). The ligand lithium salt reacted with BiCl₃ to give a 2 : 1 complex L₂BiCl. A 1 : 1 complex LBiCl₂ was obtained in good yield by the redistribution reaction between L₂BiCl and BiCl₃. X-ray diffraction analysis revealed that the ligand L coordinated in an expected κ³-C,N,N′ coordination mode in LBiCl₂, while it coordinated in κ³-C,N,O and κ²-C,O coordination modes in L₂BiCl. The ligand precursor reacted with BiX₃ (X = Cl, Br) to give 1 : 1 complexes L′BiX₃ and was found to act as a neutral tripodal C(π),N,N-ligand.