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Towards functional metallo-supramolecular assemblies and polymers
Published in Y. Yagci, M.K. Mishra, O. Nuyken, K. Ito, G. Wnek, Tailored Polymers & Applications, 2020
One interesting procedure in supramolecular chemistry uses molecular building blocks containing repeating subunits, with the capability to complex metal ions in a defined and predictable arrangement. In particular, multimetallic complexes of precise [m × n] nuclearity and two-dimensional geometry as models for information storage were developed. Their basic geometries may be termed racks [n]R, ladders [2n]L, and grids [m × n]G, where the nuclearity of the R, L, and G species is given by [n], [2n], and [m × n], in sequence of increasing complexity (see e.g. [1]). The ligand components are here oriented more or less orthogonal to each other [1, 32]. In these cases the metal ions serve as connecting centers for the structures and provide additional electrochemical, photochemical, and reactional properties. The choice of the ligands and metal ions represent the most important steps in the design of such coordination arrays. Transition metal ions with octahedral coordination geometry are expected to cover a wider range of usable elements and properties compared to tetrahedral metal ions used in ladder- [33] and grid-type [34] complexes before. As basic tridentate complexing unit, the well-known terpyridine, was chosen due to its property to form stable complexes with transition metal ions [35] and its interesting oxidative and reductive behavior [36–38]. To promote metal-metal interaction [39] and to enforce the alignment of the metal centers, a small metal-to-metal distance is required in the coordination arrays. These requirements are met by ligands consisting of fused terpyridine subunits containing bridging pyrimidine groups [1, 32].
Syntheses, crystal structures and photoluminescent properties of dinuclear and tetranuclear zinc complexes with 1,4-bis(2,2':6',2″-terpyridine-4'-yl)benzene
Published in Journal of Coordination Chemistry, 2021
Heng-Shi Li, Sheng-Mei Zhang, Ping Ye, Tao Sun, Kai Wang, Xiu-Qing Zhang, Yan Li
Terpyridine and its derivatives possess strong binding ability towards transition and rare-earth metal ions and the resultant complexes exhibit fascinating luminescent, electronic, photophysical, and biological properties. Therefore, such complexes have potential applications in coordination chemistry, supramolecular chemistry, materials science, opto-electronics, biology and catalysis [1–7]. 1,4-Bis(2,2′:6′,2′'-terpyridin-4′-yl)benzene (bteb) consisting of a central benzene ring connected to two peripheral terpyridine groups is a bistopic ligand with strong chelating ability to metal centers. This "back to back" bisterpyridine ligand was first used by Constable in 1992 to assemble infinite linear coordination polymers [8]. Since then, bteb has been applied to assemble molecular wires [9–14], luminescent and redox-active polynuclear transition metal complexes [15–22], metallodendrimers [23], luminescent sensors [24–27], metallo-supramolecular coordination polyelectrolytes [28–32], supramolecular self-assembly [33–35] and metal organic frameworks (MOFs) [36]. However, most studies focused on the characterization of bteb metal complexes in solution. Their preparative and structural studies are not sufficient yet [26,37].
Anticancer activities and DNA/BSA interactions for five Cu(II) compounds with substituted terpyridine ligands
Published in Journal of Coordination Chemistry, 2023
Xin Guan, Haiyan Wen, Benwei Wang, Zhiyuan Wang, Yanling Zhou, Hongming Liu, Hailan Chen, Lixia Pan, Zhen Ma
Owing to the σ electron-donating and π electron-accepting capabilities, terpyridine and its derivatives can construct stable complexes with different kinds of metals and hence have attracted interest [14, 15]. For example, numerous Pt(II), Zn(II), Cd(II), and Pd(II)-terpyridine complexes have been reported to have antitumor activities [16–20]. What’s more, the terpyridine metal complexes can bind with DNA, and DNA plays an important role in cellular bioactivities. The interaction of small molecules with DNA and the DNA cleavage of these compounds are worth studying because of their values for the search of new drugs [21].
4′-(2-Methylphenyl)-2,2′:6′,2″-terpyridine: coordination chemistry with Ni(II), Cu(II), Zn(II) and Ag(I)
Published in Journal of Coordination Chemistry, 2019
Gurpreet Kaur, Matthew I. J. Polson, Richard M. Hartshorn
2,2′:6′,2″-Terpyridines can be synthesized with substituents at many different positions. One of the most common substitution sites is the 4′ position of the central pyridine ring, due to their accessibility from the appropriate aldehyde [25]. There are two main synthetic routes for the production of terpyridines, the cross-coupling method and the ring assembly method, and numerous 4′-substituted-2,2′:6′,2″-terpyridine molecules have been synthesized via these paths [21]. Further functionalization is possible on a pendant phenyl ring, and we have explored a particular example of that [26].