合成了在仲胺氮上被2-羟基-3,5-二甲基苄基取代的两个新的六氮杂大环H 4 L 1和H 4 L 2;H 4 L 2的晶体结构表明,六个氮供体原子在固态下均具有椅子构象,且单去质子化H 4 L 1,[Gd(H 3 L 1)(NO 3)的ado (III)配合物] NO 3 .3H 2O,具有结合至一个酚氧原子的九坐标nine,来自一个硝酸盐的两个氧原子和来自大环配体的六个氮供体。
Hexaaza and octaaza macrocycles with 2-hydroxy-3,5-dimethylbenzyl pendant arms
作者:S. W. Annie Bligh、Nick Choi、Evagoras G. Evagorou、Mary McPartlin
DOI:10.1039/a704835a
日期:——
New 18-membered hexaaza (3 and 4) and 24-membered octaaza (7 and 8) macrocycles with 2-hydroxy-3,5-dimethylbenzyl pendant arms have been prepared via a Mannich type reaction of the corresponding macrocycles [(1 and 2) and (5 and 6) respectively] with 2,4-dimethylphenol in the presence of methanal in a methanolic solution. X-Ray structure analysis shows the tetramethyl substituted hexaaza macrocycle with 2-hydroxy-3,5-dimethylbenzyl pendant arms 4 and its precursor [H42]4+ both have centrosymmetric molecules with step conformation. Differences in conformation arise from hydrogen bonding interactions; in [H42]4+ bonding between amino nitrogen atoms and water molecules appears to tie the backbone chain of the macrocycle together, and in 4 strong intramolecular hydrogen bonding with each 2-hydroxybenzylamino unit dictates the orientation of the pendant arms.
Synthesis and crystal structure of a novel hexaaza macrocyclic ligand with 2-hydroxy-3,5-dimethylbenzyl pendant arms and its gadolinium(III) complex
作者:S. W. Annie Bligh、Nick Choi、W. Jon Cummins、Evagoras G. Evagorou、J. Duncan Kelly、Mary McPartlin
DOI:10.1039/dt9930003829
日期:——
six nitrogen donor atoms adopt a chair conformation in the solid state, and the gadolinium(III) complex of monodeprotonated H4L1, [Gd(H3L1)(NO3)]NO3.3H2O, has a nine-co-ordinate gadolinium bound to one phenolic oxygen atom, two oxygen atoms from one nitrate and six nitrogen donors from the macrocyclic ligand.
合成了在仲胺氮上被2-羟基-3,5-二甲基苄基取代的两个新的六氮杂大环H 4 L 1和H 4 L 2;H 4 L 2的晶体结构表明,六个氮供体原子在固态下均具有椅子构象,且单去质子化H 4 L 1,[Gd(H 3 L 1)(NO 3)的ado (III)配合物] NO 3 .3H 2O,具有结合至一个酚氧原子的九坐标nine,来自一个硝酸盐的两个氧原子和来自大环配体的六个氮供体。