Synthesis and Structures of 9-Nickelafluorenyllithium Complexes

Abstract

1), was prepared in the reaction between 2,2′dilithiobiphenyl and nickelocene in diethyl ether. Compound 1 was transformed to other 9-nickelafluorenyllithium compounds, 2) and (η 5 -(1-(η 5 -cyclopentadienyl))-1nickelafluorenyl)lithium(dimethoxyethane) (3), whose crystal and molecular structures were determined by single-crystal X-ray analysis.

Novel, axially chiral analogues of nickelocene with nickeladibenzofluorenyl ligand

“…We have found that the ground state of 9-nickelafluorenide complex has spin multiplicity of 1, which is in good agreement with experimental results [1]. Triplet state lies 105 kJ/mol above singlet.…”

“…We have reported the synthesis of 9-nickelafluorenyllithium complexes [1], novel metallafluorenyl-alkali metal compounds that contain a transition metal in the five-membered metallacyclic ring. Such compounds proved to be very useful in the synthesis of metallametalocenes.…”

“…In previous papers we described the synthesis of new nickelametallocenes [3] which possessed one nickelaindenyl or nickelafluorenyl ring [4]. More recently we have employed 9-nickelafluorenyllithium [1], in the synthesis of the first analogues of nickelocene and cobaltocene with two nickelafluorenyl rings [5].…”

Dibenzometallacyclopentadienes, boroles and selected transition metal and main group heterocyclopentadienes: Synthesis, catalytic and optical properties

“…The coordination of DME to the Li cation generates the free anionic [NiCp(2,2 -bph)] − complex (31) (Fig. 17) [27].…”

“…the now popular 2-phenylpyridine complexes mentioned in the Introduction [3,4]. Rillema and co-workers have extensively studied the absorption and emission properties of a number of Pt(2,2 -bph) complexes with the mono-and bidentate ligands, pyridine, acetonitrile, ethylenediamine, CO (27) [23,42], dppm [44,45], and the bridging ligand SEt 2 [41]. Absorption spectra of mono-metallic [Pt(2,2 -bph)(py) 2 ] (52), [Pt(2,2 -bph)(NCMe) 2 ] bonyl complex 27 have been carried out to examine singlet and triplet excited states, and to compare calculated geometries with those from the X-ray crystallographic data previously obtained [42,43].…”