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Syntheses and structures of a class of bridged bis(amidinate)s and derivatives

Posted on 20. June, 2018.

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Amidinates are versatile ligands used in the fields of coordination and organometallic chemistry because their steric and electronic properties can be easily modulated by varying the substituents on the C and N atoms.

Bridged bis(amidinate)s as a special branch of amidinates have proven to be very versatile as they permit changes to the ‘bridge’ and the substituents of the amidine groups. The frameworks have a rigid coordination sphere and provide a control over the geometry of the active metal centre. For example, the phenylene bridged ligands [1,4-C6H4C(NR)2}2]2− (R = cyclohexyl, iPr, SiMe3)6 and the oxalic amidinates have been used to form bimetallic complexes. o-Phenylene-, naphthalene-, and propane-linked bis(amidinate) complexes have been chelated to a monometal. Silyl- and cyclohexyl- bridged bis(amidinate)s lead to different configurations by variation of the terminal substituents on the framework. The reported examples of bridged bis(amidinate)s are mainly divided into two types: the traditional silylated and robust nonsilylated amidinates. This study details the efforts of the authors to extend the range of nonsilylated amidinates and derivatives with a variety of ‘bridges’ and N-aryl substituents. In this paper, the authors report the synthesis and structures of a class of bridged bis(amidinate)s and their derivatives containing pyrrole rings.

Read the full article in Journal of Chemical Research, Volume 42, Number 5, June 2018, pp. 239-243


Authors: Fen-Hua Wang*, Song Wang, Jiang-Sheng Huang, Jun Zhang and Chun-Mei Ding
College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 241000, P.R. China

Keywords: bridged bis(amidinate)s, phenylene linker, cyclohexylene linker