Terpyridine chemical structure

A complete description of the synthetic methodology and the characterization of the obtained metallosupramolecular block copolymers was reported in a recent paper [324]. These compounds have been referred to as metallosupramolecular block copolymers and designated by the acronym Ax-[Ru]-By, where A and B are the two different polymer blocks, -[Ru]- denotes the fczs-2,2/ 6/,2/terpyridine-ruthenium(II) linkage between the A and B blocks, and x and y represent the average degree of polymerization of the A and B blocks, respectively. The chemical structure of a PEB-[Ru]-PEO metallosupramolecular copolymer is depicted in Fig. 23. 

Fig. 7.13 Chemical structures and cartoons of multifunctional ligands containing both pyridine (blue) and terpyridine (red) coordi-...

We found that one of the crystal polymorphs of terpyridine (3) showed bright blue luminescence, while the other was non-luminescent. The results clearly indicate that the on- and off-states of the luminescence are controlled by the specific mode of molecular packing, and reproducible on-off switching of the luminescence is realised by heat-mode interconversion between two crystal polymorphs. Until recently, routine methods for tuning the luminescent properties of dye moleeules were mostly limited to modification or alteration of their chemical structures. 

FIGURE 5.1.7 (a) Reversible complex formation of Ru-terpyridine during the BZ reaction, (b) Chemical structure of the terpyridine terminated octa-PEG. (c) Oscillating profile of viscosity of the aqueous solution containing Ru(tpy)rtetra or Ru(tpy)2-octa PEG, HNO3, NaBrOs, and MA at 25°C... 

FICURE 10.6 Chemical structures of (a) 2-dimethylaniinomethylphenyl (damp), (b) 1,4,8,11-tetraazacy-clotetradecane (cyclam), (c) phenanthroline (phen), (d) 1,2-ethylenediamine (en), (e) diethylenetriamine (dien), and (f) terpyridine (terpy). 

Constable, E.C., Henney, R.P.G., Leese, T.A. and Tocher, D.A. (1990) Cyclometallation reactions of 6-phenyl-2,2 -bipyridine a potential C,N,N-donor analogue of 2,2 6, 2"-terpyridine. Crystal and molecular structure of dichlorobis (6-phenyl-2,2 -bipyridine)ruthenium(II). Journal of the Chemical Society, Dalton Transactions, (2), 443. 

Pitteri, B., Marangoni, G., Visentin, F., Bobbo, T., Bertolasi, V. and Gilli, P. (1999) Equilibrium and kinetic studies of (2,2 6, 2"-terpyridine)gold(III) complexes. Preparation and crystal structure of [Au(terpy)(0H)][C104]2. Journal of the Chemical Society, Dalton Transactions, (5), 677. 

Fig. 25. General structure of gelating terpyridine-based Pt(II) gelators described by Yam et al. TEM (left) and SEM (right) images of selected xerogels prepared from a DMSO gel (top), and a benzene gel (bottom). Reproduced with the permission of the American Chemical Society (220).

Figure 30. Photoinduced rotation, based on the use of an oxidant scavenger (/>-nitrobenzylbromide), of the terpyridine-containing macrocycle in the copper-containing [2] catenane 32+ [121]. The system is brought back to the initial structure through another ring rotation, induced chemically by reduction with ascorbic acid.

One of the interesting things about the redox polymers is their use in the creation of the molecular electronic devices.3-5 Redox polymer films on electrodes have been fabricated using chemical modification, electrochemical polymerization, polymer coating, and so on.88 Recently, stepwise complexation methods have been employed to fabricate multiple complex layers.89,90,91 In this section, the stepwise preparation of bis(tpy)metal polymer chains by combining terpyridine (tpy) ligand self-assembled monolayer (SAM) formation and metal-tpy coordination reactions is described as an example. This method realized the formation of a desired number of polymer units and a desired sequence of Co-Fe heterometal structures in the polymer chain.92... 

Figure 14 Synthesis of tritopic terpyridine ligands 52—54 using the Sonogashira coupling and their self-assembly into cage structures 55—57 under thermodynamic control with IVl = Zn". Energy minimized structures and dimensions and 2D DOSY NMR spectra of 55 (left), 56 (middle), and 57 (right). Adapted with permission from Ref. 14JA10499. Copyright 2014 American Chemical Society.

---