Untitled

Abstract

The use of the "complexes as ligands and complexes as metals" synthetic strategy for the preparation of luminescent and redox-active Ru(II) and Os(II) dendrimers, the dominant synthetic approach for this novel class of compounds, is reviewed. A few comments on the photophysical and redox properties of the metal dendrimers are provided and an overview of alternative synthetic approaches is also presented.

Density matrix renormalization group algorithm for Bethe lattices of spin-12or spin-1 sites with Heisenberg antiferromagnetic exchange

“…Dendrimer are macromolecules with repetitive branches attached to a central core or focal point [1,2]. Three parameters (b,Z,g) characterize the dendrimer lattice model in Fig.1: the number of branches b attached to the focal point, the connectivity Z of a site and the number of generations g. Many natural systems are dendrimers and molecular engineering can produce custom dendrimers with constituents that range from carbon-based molecules [3] to organo-metallic compounds [4,5]. Potential applications include drug delivery for chemotherapy [3], gene therapy [6], magnetic resonance imaging as contrast agents based on superparamagnetism [7], and molecular recognition [8].…”

Osmium: Inorganic & Coordination Chemistry

“…94, 95 This work has been further extended to include decanuclear dendrimers bearing three different metal ions for example, Os{(µ-2,3-dpp)Ru-[(µ-2,3-dpp)PtCl 2 ] 2 } 3 (PF 6 ) 8 at the core and three external Ru II complexes associated with six pyrenyl chromophores attached to the periphery have been described. The aim here is to harvest light and promote a periphery to core energy transfer.…”

“…94, 95 The energy transfer between units is very fast due to sufficiently strong electronic interaction; for the complexes of 2,3-dpp this takes place within 200 fs. Therefore, these dendrimers can be used to perform valuable functions such as light harvesting and the controlled storage or release of a given number of electrons at a certain potential.…”

Where organometallics and dendrimers merge: the incorporation of organometallic species into dendritic molecules

“…Using methodology previously employed to assemble Fe and Ru dendrimers [5,6,20], the synthesis consists of the assembly of Fréchet-type wedges containing two rhenium centers and coupling them, through a benzylic bromide, to the 1,1,1-tris(4-hydroxyphenyl)ethane core. The structure of dendrimer 38 is shown in Fig.…”

“…As such, we will focus on the developments in the field after this time. Some other reviews have appeared [7][8][9]20] but do not strictly focus on organometallic dendrimers, as defined here. While this report is not intended to be comprehensive, our aim is to give an overview of the field and highlight specific examples that illustrate general synthetic strategies or particularly useful reactions as well as the utility and application of these interesting dendrimers.…”