Synthesis of a Di-N-cyanoethylated Tetraaza Macrocycle Containing Eight C-Methyl Groups and Its Nickel(II) Complex: Effects of the Methyl Groups on Their Properties

Bulletin of the Korean chemical society

Jinkwon Kim¹  Kiseok Ryu¹  Shin-Geol Kang¹ 

关键词: Macrocyclic compounds;    Nickel(II) complexes;    Cyanoethyl pendant arms;    Crystal structure.;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

A new di-N-cyanoethylated 14-membered tetraaza macrocycle 1,8-bis(2-cyanoethyl)-3,5,7,7,10,12,14,14-octamethyl-1,4,8,11-tetraazacyclotetradecane (L² ) and its nickel(�?) complex [NiL²(OAc)]⁺ have been prepared. The square-planar complex [NiL² ](ClO₄)₂ can be prepared by addition of HClO₄ to a hot aqueous solution of [NiL² (OAc)]⁺ . The Ni-N (tertiary amino group) bond distances (2.008�?) of [NiL²](ClO₄)₂ are relatively long, and the complex exhibits a d-d transition band at unusually long wavelength (ca. 515 nm). The complex [NiL² ](ClO₄)₂ rapidly reacts with acetate ion or ethylenediamine (en) to produce [NiL²(OAc)]⁺ or [Ni(en)₃]²⁺ , respectively, and is readily decomposed in NaOH (0.01 M) solution. The chemical properties of [NiL²]²⁺ as well as its synthetic procedure are quite different from those for other related 14-membered tetraaza macrocyclic complexes. Effects of the N-cyanoethyl and C-methyl groups on the properties of L²

【 授权许可】

Unknown