Host-Guest-Driven Copolymerization of Tetraphosphonate Cavitands
作者:Francesca Tancini、Roger M. Yebeutchou、Laura Pirondini、Rita De Zorzi、Silvano Geremia、Oren A. Scherman、Enrico Dalcanale
DOI:10.1002/chem.201002237
日期:2010.12.27
The outstanding complexing properties of tetraphosphonatecavitands towards N‐methylpyridinium salts were exploited to realise a new class of linear and cyclic AABB supramolecular polymers through host–guest interactions. The effectiveness of the selected self‐association processes was tested by 1H NMR studies, whereas microcalorimetric analyses clarified the binding thermodynamics and revealed the
利用四膦酸酯空洞分子与N-甲基吡啶鎓盐的杰出络合特性,通过宿主-客体相互作用实现了一类新型的线性和环状AABB超分子聚合物。所选自缔合过程的有效性通过1 H NMR研究进行了测试,而微量热分析则阐明了结合热力学,并揭示了通过影响客体连接子的柔性来调节熵贡献的可能性。尽管通过X射线分析证明了刚性体系中线性聚合物链的形成,但是在非常灵活的对位BB客体共聚单体的情况下,溶液粘度测量表明存在浓度依赖性的环链平衡。
Self-assembly of manganese(<scp>i</scp>) based thiolato bridged dinuclear metallacycles: synthesis, characterization, cytotoxicity evaluation and CO-releasing studies
Self-assembly of four components has resulted into the formation of M2L2 type dinuclear metallacyclophanes [Re(CO)(3)Br(mu-L)](2)(1-5), using flexible ester functionalised organic spacers and metal precursor containing fac-Re(CO)(3) corners. The dinuclear metallacyclophanes were synthesized from ReBr(CO) 5 and ditopic pyridyl ligands (L) (L etdp, prdp, budp, pedp and hedp). The self-assembled compounds 1-5 were characterised by elemental analysis, IR, NMR, absorption and emission spectroscopic techniques. Molecular structure of 1 and 2 have been characterised by single crystal X-ray diffraction methods and the molecular masses of 3-5 were evaluated by ESI-MS. Cytotoxicity studies of metallacyclophanes 1, 3 and 5 on six different cancer and normal cells revealed that the metallacyclophanes selectively inhibit certain cancer cells. Especially, compound 5 showed broad-spectrum inhibitory activities in five cancer cells tested with low IC50 value comparable to a reference compound (cisplatin). The anticancer activity of compound 5 is attributed to the induction of early apoptosis. Hence, this class of compounds forms potential anticancer agents. (C) 2014 Elsevier B. V. All rights reserved.