Premium
Pnictides as Symmetrically Bridging Ligands in Novel Neutral Complexes
Author(s) -
Scheer Manfred,
Müller Jan,
Schiffer Michael,
Baum Gerhard,
Winter Rainer
Publication year - 2000
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/(sici)1521-3765(20000403)6:7<1252::aid-chem1252>3.0.co;2-n
Subject(s) - chemistry , ligand (biochemistry) , amine gas treating , crystallography , stereochemistry , derivative (finance) , nuclear magnetic resonance spectroscopy , tris , organic chemistry , biochemistry , receptor , financial economics , economics
The reaction of [LWCl] ( 3 ) [L=N(CH 2 CH 2 N i Pr) 3 ] with LiE/SiMe 3 ) 2 (E=P, As, Sb) yields the novel, neutral pnictido‐bridged complexes [LW=E=WL] ( 5 – 7 ). By following the reaction, which starts from the LiP/SiMe 3 ) 2 derivative, by 31 P NMR spectroscopy, the formation of an intermediate with a terminal pnictido ligand can be ruled out. The paramagnetic complexes 5 – 7 are comprehensively spectroscopically characterised. The X‐ray structure analysis of the heterocumulenes 5 – 7 reveals a linear structure in which the two W‐“tren” units bind to the central pnictido atom in a staggered conformation [“tren”=tren‐based ligand; tren=tris(2‐aminoethyl)amine. When N 2 is used as the inert gas in the synthesis of the starting material [{N(CH 2 CH 2 NNp) 3 }WCl] [Np=CH 2 C(CH 3 ) 3 ], the complex [{[N(CH 2 CH 2 NNp) 3 ]W} 2 ( μ , η 1 : η 1 ‐N 2 )] ( 4 ) is formed as a side product. Complex 4 possesses a hydrazido(4−) (N 2 4− ) ligand connected by two tungsten‐“tren” moieties.