Dinuclear and polynuclear transition metal complexes with macrocyclic ligands. 6. New dinuclear copper(ii) complexes with macrocyclic Schiff bases derived from 4-tert-butyl-2,6-diformylphenol
作者:V. V. Roznyatovsky、N. E. Borisova、M. D. Reshetova、Yu. A. Ustynyuk、G. G. Aleksandrov、I. L. Eremenko、I. I. Moiseev
DOI:10.1023/b:rucb.0000042275.94158.b6
日期:2004.6
Newdinuclearcomplexes containing CuII atoms in the cavity of a macrocyclic Schiffbase were prepared by template condensation of 4-tert-butyl-2,6-diformylphenol with 1,3-diaminopropane in the presence of CuII trimethylacetate and chloride as well as by extra-ligand exchange. The mononuclearCuIIcomplex with two 1,3-diaminopropane molecules can serve as an intermediate in this template synthesis
4-叔丁基-2,6-二甲酰基苯酚与1,3-二氨基丙烷在CuII三甲基乙酸酯和氯化物存在下,通过模板缩合制备了大环席夫碱空腔中含有CuII原子的新型双核配合物。 -配体交换。具有两个 1,3-二氨基丙烷分子的单核 CuII 复合物可作为该模板合成的中间体。CuII三甲基乙酸酯与早先合成的不对称大环席夫碱的反应提供了一种新的双核铜(ii)配合物,其在配位球中具有胺和亚胺氮原子。新配合物的结构通过 X 射线衍射分析建立,并通过密度泛函理论(梯度校正 PBE 泛函,TZ2p 基组)进行研究。
Self-assembly of a palladium complex formed from two U-shaped calixsalen molecules
作者:Nataliya E. Borisova、Rizvan K. O. Askerov、Abel M. Maharramov、Victor N. Khrustalev、Marina D. Reshetova、Yuri A. Ustunyuk
DOI:10.1039/c002813d
日期:——
U-shaped calixsalens can be efficient building blocks for the construction of molecular boxes or cavitands. The first example of a calixsalen complex that has no coordination between the metal ion and phenolic oxygen atom was provided by X-ray. The resulting molecular structure has a high thermal stability, but completely degrades after the addition of DMSO.
U 型卡利沙林可以成为构建分子盒或空穴体的有效构件。X 射线首次提供了金属离子与酚氧原子之间不配位的钙沙林络合物。由此产生的分子结构具有很高的热稳定性,但在加入二甲基亚砜后会完全降解。
Binuclear and polynuclear transition metal complexes with macrocyclic ligands. 3. New polydentate macrocyclic ligands in reactions of 4-alkyl-2,6-diformylphenols with 1,2-diaminobenzenes
作者:N. E. Borisova、M. D. Reshetova、Yu. A. Ustynyuk
DOI:10.1023/b:rucb.0000024848.03470.25
日期:2004.1
accompanied by the reduction of two of four double C=N bonds in macrocyclicSchiff"s bases formed was studied by DFT (gradient-corrected PBE functional, TZ2p basis set). In the first step, [1+1] Schiff"s base is formed and disproportionates further to afford amine and benzoimidazolylphenols. Two new macrocyclic polydentate ligands containingtwo CH2—NH moieties in the rings were synthesized. The reduction
作者:Yu. A. Ustynyuk、N. E. Borisova、V. M. Nosova、M. D. Reshetova、S. S. Talismanov、S. E. Nefedov、G. A. Aleksandrov、I. L. Eremenko、I. I. Moiseev
DOI:10.1023/a:1015564403703
日期:——
Condensation of 4-tert-butyl-2,6-diformylphenol with 1,2-diaminobenzene in ethanol is accompanied by partial reduction of the azomethine double bonds to form symmetrical macrocyclic Schiff's base containing the alternating >C=N and >CH-NH fragments. In solution, this compound exists as the only isomer in which two endocyclic hydrogen atoms are bound to the oxygen atoms of the phenol groups and two other endocyclic H atoms are attached to the nitrogen atoms of the CH2-NH fragments. All endocyclic protons are involved in hydrogen bonding and undergo rapid exchange with each other at room temperature. In the crystal, the planar macrocyclic molecules are arranged in closely packed stacks. The steric hindrances resulting from overlapping of the bulky tert-butyl groups are eliminated through rotation of the molecules with respect to each other in the adjacent layers. Study of the potential energy surface for the Schiff's base under consideration by the DFT method demonstrated that the structure corresponding to the global minimum is similar to that found in solution, However, the isolated molecule is nonplanar, its macrocycle adopting a ladder conformation. The local minimum on the potential energy surface whose energy is 2.6 kcal mol(-1) higher than that of the global minimum corresponds to the zwitterionic structure in which all four endocyclic hydrogen atoms are attached to the nitrogen atoms and the macrocycle adopts a tub conformation. Flattening of the ring is considered as a consequence of stacking interactions between the molecules in the crystal.