The bis(catecholamide)
α,α′-bis(2,3-dihydroxybenzoylamino)-m-xylene
(H
4
L
3
) has been synthesized and characterised. It
is an analogue of the naturally occurring siderophore azotochelin and
structurally related to an approved enterobactin model. Two
dioxomolybdenum(VI) complexes of it have been synthesized,
namely a di- and a mono-nuclear one. Variable-temperature proton NMR
studies of the initially obtained dinuclear compound revealed that three
kinetic processes are operative in Me
2
SO solution:
geometrical isomerisation at lower temperatures, and inversion of
configuration concomitant with dissociation into the monomer at higher
temperatures. In contrast, the mononuclear complex obtained in this way
isomerises and inverts almost simultaneously at 343–353 K. The
crystal structure of
Na
2
[MoO
2
L
3
] confirmed the
mononuclear nature of the complex and revealed that the cis,
cis, cis geometrical isomer is adopted in the solid
state.
双(
儿茶酚胺)α,α′-双(2,3-二羟基苯甲酰
氨基)-
间二甲苯(H4L3)已合成并鉴定。它是一种天然存在的
铁载体
氮化铁的类似物,在结构上与一种已批准的肠杆菌素模型有关。已合成了两种二氧代
钼(VI)复合物,即二核和单核。对最初获得的双核化合物进行可变温度质子核磁共振(NMR)研究显示,在Me2SO溶液中有三种动力学过程:在较低温度下发生几何异构化,在较高温度下发生构象反转并分解为单体。与此相反