Spheroid Metallocavitands with Eight Calixarene-Shaped Receptors on the Surface

Abstract

Spheroid metallocavitands [((Re(CO)3L)3)2L'] with a diameter of ~17 Å, possessing eight solvent-accessible calixarene-shaped receptors on the surface, were obtained from a Re2(CO)10, rigid NN donors (H-L), and flexible hexatopic N donors (L') in a one-step process.

Rhenium‐Carbonyl‐Based Supramolecular Coordination Complexes: Synthesis, Structure and Properties

“…Six calix[4]arene shaped exo‐cavities are present on the circular space that can accommodate small molecules. Solid state structures of 30a–30c confirm the ability of these molecules to accommodate guest molecules in its exo –calixarenes shaped cavities ,…”

“…Solid state structures of 30a-30c confirm the ability of these molecules to accommodate guest molecules in its exo-calixarenes shaped cavities. [107,108] Ligand modification allowed cavity alteration on these spheroid metallocavitands by introducing metallocalix [3]arene and calix [4]arene type receptor sites at the curvature of the spherical surface with acetone molecules occupying these convex cavities. In these structures, the size of the anionic motif and the neutral multitopic donor affected the overall size of the supramolecule as well as the geometry of the exocyclic convex cavity, thus providing a control over the number, size and position of the cavity at the exterior surface of the metallacyclic structure.…”

Structure, electronic, inclusion complex formation behavior and spectral properties of pillarplex

“…Additionally, the formed supramolecules can also be air and moisture sensitive, thereby limiting their application [15]. Recently, there have been several reports on metallo-cavitands, rectangles, cages and nano-capsules, which are found to be either fluorogenic sensors for metal ions or capable of selective binding of heavy metals [16][17][18][19].…”

Rhenium(I)-based Double-heterostranded Helicates

“…[1] Among the several metal ion-based SCCs, the fac-Re(CO) 3 -based complexes are in general kinetically inert, neutral, and display interesting photophysical properties. [2][3][4] The Re-based SCCs are generally assembled using anionic bis-chelating N∩N-/O∩O-/ N∩O-donors and neutral N donor ligands. Recently, the focus was shifted to use functionalized benzimidazolyl coordinating units incorporating di-/tri-/tetra-topic ligands to construct various sizes of Re-SCCs because the nature of the donor unit, the spacer moiety, and the substituents on both units influence the resulting architecture and properties of SCCs.…”

“…Recently, the focus was shifted to use functionalized benzimidazolyl coordinating units incorporating di-/tri-/tetra-topic ligands to construct various sizes of Re-SCCs because the nature of the donor unit, the spacer moiety, and the substituents on both units influence the resulting architecture and properties of SCCs. [3] Although the incorporation of furan/thiophene/SH/ SMe functions on the benzimidazolyl core is now well established, attempts to change/modulate the central phenylene spacer by other functional spacer are rare in Re-based SCCs. [2][3][4] In an attempt to modulate the phenylene spacer in the ditopic benzimidazolyl donors, Troger's base (TB) was chosen due to its C 2 -symmetric heterocyclic nature with relatively rigid backbone, hydrophobic cavity, concave conformation, and the applications of its derivatives in molecular recognition, catalysis, bio-imaging and sensing (Fig.…”