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Tetrapyrroles metal complexes

The most important natural photochemical process is undoubtedly photosynthesis. Exploitation of artificial photophysical and photochemical processes of tetrapyrrole metal complexes has been focused on the following areas ... [Pg.183]

The metabolism of naturally occurring tetrapyrrole metal complexes includes irreversible oxygenation and hydrogenation reactions (bile pigment formation, protochlorophyll hydrogenation). [Pg.3]

Tetraphosphine ligands, 995 Tetrapyridyls metal complexes, 91 geometry, 91 Tetrapyrroles metal complexes, 79 T etraselenoether metal complexes, 666 Tetrasulfur tetranitride metal complexes, 799 Tetrathiolane, bis(imino)-metal complexes, 591 Tetrathiooxalic acid metal complexes, 585, 606 Tetrathiosquaric acid metal complexes, 606 Tetrazole, 2-methyl-metal complexes, 77 Tetrazole, pentamethyl-metal complexes, 77 Tetrazoles metal complexes, 76 pK,ll... [Pg.1745]

Octaethylbilindione (H3OEB) is a convenient model for the bile pigment biliverdin IXa. Key redox states of this ligand as observed in its complexes are shown in Figure 14. The redox behavior of the palladium complex of octaethylbilindione was examined in order to determine the generality of the redox behavior of this group of transition metal complexes.202 A preliminary report on the novel tetrameric Pd4(OEB)2, which contains palladium) ) ions 7r-bonded to C=C bonds of the tetrapyrrole ligand, and of Pdn(OEB ) has appeared.203... [Pg.570]

Coordination compounds composed of tetrapyrrole macrocyclic ligands encompassing a large metal ion in a sandwich-like fashion have been known since 1936 when Linstead and co-workers (67) reported the first synthesis of Sn(IV) bis(phthalocyanine). Numerous homoleptic and heteroleptic sandwich-type or double-decker metal complexes with phthalocyanines (68-70) and porphyrins (71-75) have been studied and structurally characterized. The electrochromic properties of the lanthanide pc sandwich complexes (76) have been investigated and the stable radical bis(phthalocyaninato)lutetium has been found to be the first example of an intrinsic molecular semiconductor (77). In contrast to the wealth of literature describing porphyrin and pc sandwich complexes, re-... [Pg.491]

Buchler, J. W., ElsSsser, K., Kihn-Botulinski, M., Scharbert, B. Angew. Chem. 1986, in press. Number 41 in the series Metal Complexes with Tetrapyrrole Ligands. [Pg.103]

Metal Complexes of Carbon-Based. Tetrapyrroles Other Than Metal Porphyrins... [Pg.15]

Corroles and corrinoids - For results on the noble metal complexes of this interesting class of tetrapyrroles, see the article by S. Licoccia in this volume [105]. [Pg.16]

In this review we will focus on synthetic derivatives of the macrocycles where a tetrapyrrolic skeleton is maintained and on their metal complexes without taking into account their biologically active counterparts. [Pg.75]

Two major strategies have been considered in order to obtain metallocorrolates the first one consists of the reaction of the preformed macrocycle with metal ions, while the second involves the oxidative, base induced cycliz-ation of the open-chain tetrapyrrolic precursor dihydrobilin (1,19-dideoxybiladiene-a,c) in buffered alcoholic solution in the presence of metal salts. By proper tuning of the experimental conditions (reaction time, solvent, metal carrier) several metal complexes have been obtained and characterized. [Pg.82]

A characteristic feature of nearly all complexes discussed in this section is the presence of a transition metal as the central atom. In contrast, tetrapyrrole ring localized redox reactions are typical for non-transition metal complexes having redox stable central atoms (e.g. Mg(II), Zn(II), Al(III)). [Pg.159]

Metal complexes with tetrapyrrole ligands / vol. ed. J. W. Buchler. [Pg.216]

The present Volume 84 of Structure and Bonding is entitled "Metal Complexes with Tetrapyrrole Ligands III" and completes a series of three volumes dedicated to this general topic which started with Volume 64 and continued with Volume 74. The first volume contained topics such as stereochemistry of metal lotetrapyrroles, infrared and Raman spectra, biomimetic porphyrins, or metal loporphyrins with metal-carbon single bonds and metal-metal bonds. In the second volume, subjects like extended X-ray absorption fine structure or metal tetrapyrroles with special electrical and optical properties were covered. [Pg.219]

The articles written for the previous volumes (Struct. Bonding Vols 64 and 74, having appeared 1987 and 1990, respectively) on "Metal Complexes with Tetrapyrrole Ligands" are also listed in the following Table of Contents. [Pg.220]

Corroles are tetrapyrrole macrocycles that are closely related to porphyrins, with one carbon atom less in the onter periphery and one NH proton more in their inner core. They may also be considered as the aromatic version (identical skeleton) of the only partially conjugated corrin, the cobalt-coordinating ligand in Vitamin B. Two potential application of corroles are in tumor detection and their use in photovoltaic devices. Selective snbstitntion of corroles via nitration, hydroformylation, and chlorosulfonation for the gallinm were studied in detail and the respective mechanistic pathways and spectroscopic data were reported, (an example is shown in Fignre 27). Overall, over 139 varions corroles were synthesized and the effect of various metal complexation pertaining to their selective reactivity examined. ... [Pg.1391]

Figure 4.27 (a) Ortep plot of one molecule and (b) stick bond model projection of Ce(OEP)2 [42]. (Reprinted with permission from J.W. Buchler, et ah, Metal complexes with tetrapyrrole ligands. 40. Cerium(IV) bis(octaethylporphyrinate) and dicerium(III) tris(octaethylporphyrinate) parents of a new family of lanthanoid double-decker and triple-decker molecules, Journal of the American Chemical Society, 108, no. 13, 3652-3659, 1986. 1986 American Chemical Society.)... [Pg.161]

Chlorophylls are a subgroup of the cyclic tetrapyrroles. They are large, relatively rigid aromatic molecules. They are planar, but deviations from planarity are observed for most Chls in photosynthetic proteins. The four central nitrogens can bind a variety of central metals. The stabilities of these metal complexes vary widely. The Mg++ characteristic of Chls is lost... [Pg.229]


See other pages where Tetrapyrroles metal complexes is mentioned: [Pg.232]    [Pg.229]    [Pg.7219]    [Pg.232]    [Pg.229]    [Pg.7219]    [Pg.96]    [Pg.306]    [Pg.94]    [Pg.479]    [Pg.66]    [Pg.93]    [Pg.101]    [Pg.278]    [Pg.431]    [Pg.459]    [Pg.273]    [Pg.189]    [Pg.189]    [Pg.189]    [Pg.189]    [Pg.190]    [Pg.566]    [Pg.3]    [Pg.428]    [Pg.430]    [Pg.418]   
See also in sourсe #XX -- [ Pg.2 , Pg.79 ]




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