A correlation involving 1H NMR spectra and exchange coupling constants of a family of phenoxo-bridged macrocyclic dicopper(ii) complexes
作者:Sasankasekhar Mohanta、Bibhutosh Adhikary、Sujoy Baitalik、Kamalaksha Nag
DOI:10.1039/b103816h
日期:2001.11.1
dicopper(II) complexes derived from 4-methyl (or tert-butyl)-2,6-diformyl/diacetyl/dibutyrylphenols and linker diamines such as 1,2-diaminoethane, 1,3-diaminopropane, 1,4-diaminobutane or 1,2-diaminobenzene have been studied in (CD3)2SO at 25 °C. The hyperfine-shifted 1H NMR signals have been assigned from their measured longitudinal relaxation times (T1) and peak areas. The two copper(II) centres
衍生自4-甲基(或叔丁基)-2,6-二甲酰基/二乙酰基/二丁酰基苯酚和连接基二胺(例如1,2-二氨基乙烷,1,3- )的11种大环四亚氨基二酚盐双铜(II)配合物的1 H NMR光谱已在(CD 3)2 SO中于25°C研究了二氨基丙烷,1,4-二氨基丁烷或1,2-二氨基苯。超细位移的1 H NMR信号已从其测得的纵向弛豫时间(T 1)和峰面积进行分配。这些化合物中的两个铜(II)中心与交换耦合常数-2 J(H = -2JS 1 · S 2)位于690至860 cm -1之间。结果表明,化学位移(的曲线δ由于在298K的大环化合物的酚环质子)小号。相应络合物的交换耦合常数(-2 J)提供了一条平滑的S型曲线,可以通过以下表达式进行模拟:-2 J = 220.6 [1 + exp (δ -4.12)/2.93}] -1 + 667。