Abstract
Metallosupramolecular cages of the general formulas [M2(L)4][X]4 can be self-assembled in good yields, where M = Pd, X = NO3, L = L1 (1a); M = Pd, X = OTf, L = L1 (1b); M = Pt, X = OTf, L = L1 (2); M = Pd, X = OTf, L = L2 (3); L1 = 1,3-bis(pyridin-3-ylethynyl)-5-methoxybenzene; and L2 = 2,6-(pyridin-3-ylethynyl)-4-methoxyaniline, respectively. These cages have been fully characterized using 1H, 13C NMR, elemental analysis, IR spectroscopy, and electrospray mass spectrometry. Additionally the molecular structure of [Pd2(L1)4][OTf]4 (1b) was confirmed using single crystal X-ray diffraction. The capacity of central cavities of M2L4 cages to accommodate square planar metal complexes was investigated. In particular, the tetracationic cage [Pd2(L2)4][OTf]4 (3) was found to encapsulate the anionic metal complex [PtCl4]2− through electrostatic interactions and also via hydrogen bonding with the amino groups of the bridging ligand displayed by this nanocage.
Highlights
Since the discovery of crown ether, cryptands, and cavitands, prodigious progress in the host-guest chemistry field have been accomplished
All over these results are highly important to the area of host-guest chemistry of metallocages as they suggest the necessity to have two complementary effects; namely electrostatic interactions and endohedral hydrogen functionality in the metallocage, which operate in synergy for a successful encapsulation of the kinetically labile metal complex [PtCl4]2−
We have reported the self-assembly of a family of metallocage of the general formulae
Summary
Since the discovery of crown ether, cryptands, and cavitands, prodigious progress in the host-guest chemistry field have been accomplished. During the past few decades, there has been an increasing effort concerning the rational design of new functional metal organic materials, such as discrete coordination cages. These architectures generate tunable shape and size cavities, which offer potential applications as containers for storage, recognition, delivery, or catalysis 1–19. A strong hydrogen-bonding interaction between the amine ligands of the cis-platin guest and a central pyridine moiety of the cage was observed. In this area, our group has developed the use of semi-rigid bidentate ligand to construct a variety of appealing structures, such as coordination polymers, metallomacrocycles, and cages 34–39. The solution behavior as well as the capacity of these metallocages to host square planar organometallic complexes are presented and discussed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
