This cycle was repeated three times to generate a second generation dendrimer 1, depicted in fig. Peripheryfunctionalized organometallic dendrimers for. The reaction sequence for the initial stages of dendrimer formation is shown in scheme 1. Structural analysis of organometallic compounds with soft. Petar dvornic and his colleagues at michigan molecular institute in the 1990s. Regulating the anticancer properties of organometallic. Organometallic derivatives of phosphoruscontaining. Purely organometallic systems based upon metallocene and other arene metal. Organometallic dendrimers transition metals pdf al. Organometallic compounds in simpler terms these are compounds containing metalcarbon bonds examples. This merging of fields hopes to combine the properties of the organometallic or transition metal spe cies, such as catalytic 79, electrochemical, optical and. Designing dendrimers supramolecular chemistry organic. In general, compounds having a metalligand bond of considerable covalent character. Synthesis of new organic and organometallic porphyrin assemblies for optics.
Viii synthesis and functionality of organometallic dendrimers. Debye institute, department of metalmediated synthesis, utrecht university, padualaan 8, 3584 ch utrecht, the netherlands. Applications of dendrimers typically involve conjugating other chemical species to the dendrimer surface that can function as detecting agents such as a dye molecule, affinity ligands, targeting components, radioligands, imaging agents. Nlo studies on new organometallic structures at several wavelengths are now clearly desirable in order to further progress towards the elaboration of efficient organometallic molecular materials for cubic nlo applications. The incorporation of organometallic species into dendritic molecules article in cheminform 68924. We have been studying thirdorder nlo properties of rutheniumcontaining organometallic dendrimers. Pdf an overview of dendrimers and their biomedical applications. Pdf organometallic rotaxane dendrimers with fourth. Elements often encountered are palladium and platinum.
Dendrimers assure superior prospect protrusion for the biomedicine. Chapter 1 covers the synthesis and characterization of a series of zeroto secondgeneration ruthenium alkynyl dendrimers with varied peripheral groups. Organometallic rotaxane dendrimers with fourthgeneration mechanically interlocked branches wei wanga, lijun chena, xuqing wanga, bin suna,b, xiaopeng lib, yanyan zhangc, jiameng shic, yihua yuc, li zhangd, minghua liud, and haibo yanga,1 ashanghai key laboratory of green chemistry and chemical processes, department of chemistry, east china normal university. The analysis of organometallic compounds with mass spectrometry has some special features in comparison with organic and bioorganic compounds.
Some ruiicontaining organometallic dendrimers developed for cubic optical nonlinearity. The polyol stars and dendrimers can be transformed into mesylates and iodo deriva. Organometallic dendrimers combine the unique feature of the dendrimer architecture with the rich chemistry exhibited by organotransition metal complexes and have already demonstrated to be useful for a range of interesting applications such as dendrimeric. Yaghi, department of chemistry, university of michigan 930 north university avenue ann arbor, michigan 48109. Abdelaziz, agatemor christian, nola etkin, rabin bissessur department of chemistry, university of. Organometallic rotaxane dendrimers with fourthgeneration mechanically interlocked branches wei wanga, lijun chena, xuqing wanga, bin suna,b, xiaopeng lib, yanyan zhangc, jiameng shic, yihua yuc, li zhangd, minghua liud, and haibo yanga,1 ashanghai key laboratory of green chemistry and chemical processes, department of chemistry, east china normal university, shanghai 200062, peoples.
Dendritic catalysts and dendrimers in catalysis didier astruc free. Dendrimers represent a class of materials which combine unique features. Humphrey twophoton absorption, absorption saturation, and dispersion of the real and imaginary parts of the thirdorder optical nonlinearity in organometallic dendrimers, proc. The introduction of pillar 5arene rotaxane units activates dynamic features in the dendrimer and enhances the rigidity of each branch of the supermolecules. Dendrimers are the new artificial macromolecules which have the structure like a tree. By incorporation of a benzylic bromide in substituted bipy compounds, the fabrication of organometallic dendrimers was achieved. Regulating the anticancer properties of organometallic dendrimers using pyridylferrocene entities.
Synthesis of new organic and organometallic porphyrin assemblies for optics areej merhi to cite this version. These dendrimers are exceptionally useful precursors. Peripheryfunctionalized organometallic dendrimers for homogeneous catalysis peripheryfunctionalized organometallic dendrimers for homogeneous catalysis van koten, gerard. Supporting information tunable roomtemperature soft. The fourthgeneration structure described is among the highestgeneration organometallic rotaxane dendrimers reported to date. Wavelengthdependence studies of the thirdorder nonlinear optical properties of these dendrimers are. Since redoxactive organometallic units play a key role as multielectrontransfer. The metal can be situated in the repeat unit, the core or at the extremities as endgroup. Cuadrado and coworkers 23 synthesized the redoxactive dendrimers diaminobutanedendnhcofc x where x 4,8,32,64. Antimicrobial organometallic dendrimers with tunable activity. The goal of click chemistry is to generate substances by joining small units. The obtained dendrimers are air and water stable, soluble materials that show interesting differences in their hydrodynamic properties as evidenced by gel permeation chromatography. Spie 5516, nonlinear optical transmission and multiphoton processes in organics ii, 15. Inoue department of applied chemistry, faculty of engineering, ehime university, matsuyama 7908577, japan received 7 november 1999.
Functional dendrimers, hyperbranched and star polymers k. Organometallic derivatives of phosphoruscontaining dendrimers. Synthesis, properties and applications in catalysis. Progress in the controllable synthesis of novel ferrocene. Metallodendrimers composed of organometallic building. Where organometallics and dendrimers merge utrecht university. Introduction dendrimers are extremely branched, globular. Structure of puddephatts second generation ptbipy dendrimer 1. This thesis aims to extend the contribution of ruthenium alkynyl complexes in this field. This unique new family of dendrimers was discovered by dr. The incorporation of organometallic species into dendritic molecules by p. The incorporation of organometallic species into dendritic molecules published in journal of organometallic chemistry, 689, 4016. Dendrimers functionalized with the organometallic moiety mdpi.
Scanning pulse voltammetry in solution shows that the dendrimers are oxidized at potentials ranging from 0. Dendrimers are a novel class of macromolecules whose hyperbranched symmetrical architectures and special properties fascinate scientists from a wide range of disciplines. Klein gebbink, and gerard van koten journal of organometallic chemistry, 2004, volume 689, number 24. Then, the cytotoxicity of the organometallic compound ru. These metals can form octahedral sixcoordinate miv linking units from organic dihalides and. The introduction of pillar5arene rotaxane units activates dynamic features in the dendrimer and enhances the rigidity of each branch of the supermolecules. Functional dendrimers, hyperbranched and star polymers.
The synthesis and chemistry of several series of novel organometallic dendritic wedges and small dendrimers containing iron, ruthenium, cobalt and tungsten have been investigated. Annemarie caminade, valerie maraval, regis laurent and jeanpierre majoral affiliation. Research on dendrimers has exploded in the last 15 years, moving from the establishment of synthetic methodologies, particularly in the early years up to the end of nineties, towards sophisticated and wideranging applications. Organometallic rotaxane dendrimers with fourthgeneration mechanically interlocked branches. Organometallic and inorganic catalysts4145 sup ported on organic. Synthesis, characterization and thirdorder nonlinear. Polyalkylidenimine dendrimers functionalized with the. Tunable roomtemperature soft ferromagnetism in magnetoceramics of organometallic dendrimers.
These compounds can be seen as having covalent bonds between the metal and the carbon atoms. Smith,a a department of chemistry, university of cape town, rondebosch, 7701, cape town, south africa. Synthesis of new organic and organometallic porphyrin. The incorporation of organometallic species into dendritic molecules article in cheminform 68924 november 2004 with 88 reads how we measure reads. Organometallic rotaxane dendrimers with fourthgeneration. The synthesis, structure and chemistry of some novel. The dendritic molecules described above have been reported in the course of the last six years, and constitute an important advance for both fields organometallics and dendrimers. Pdf advances in the chemistry of dendrimers researchgate.
Organometallic dendrimers based on tetraphenylcyclobutadiene. The second volume on dendrimers is again written by pioneers in the field. Organometallic chemistry is a fantastic tool to activate molecules. Their contributions illuminate the aspects of dendrimers mentioned in the subtitle of this volume, and also touch on areas beyond chemistry, namely material sciences as. Synthesis, structure, and porosity of a metalorganic dendrimer framework modf 1.
In the past, the focus was on organometallic dendrimers with metallic species only at specific positions of the molecules, such as the core and the periphery. These molecules offer large hyperpolarizabilities and the possibility to control both the refractive and absorptive parts of the nonlinear response by electrochemical switching of the oxidation state of the ruthenium centres. Indeed, metallodendrimers can combine the anticancer potential of metal complexes with the features of the dendrimers as nanocarriers, and. The most stable organometallic redox systems combined in a dendritic molecule carmen m. Dendrimers play an important role in many different areas, spanning from basic synthetic approaches to artificial photosynthesis, to medicine, to. One of the most active current areas of research in the chemistry of dendrimers is the incorporation of metal centres into such structures, thus resulting in welldefined molecules with new. In this chapter, we summarize recent developments in the synthesis of organometallic dendrimers, in which organometallic species act as building block in every generation. Journal of organometallic chemistry 2004, 689 24, 40164054. In other words, dendrimers will combine the advantages of homo and. Each shell consists of two chemicals, always in the same order and is called a generation fig. Two series of first to third generation g1g3 oligoether dendrimers, one bearing a shorter spacer chain c o and the other having a longer spacer branch c c c o were prepared.
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