Manganese bimetallic complexes

The advantage of using lithiated arene complexes of chromium as starting materials to synthesize o-,7r-bimetallic complexes of chromium and manganese was clearly demonstrated by reacting (77 -o-C6H4XLi)Cr(CO)3 (X = H, F) with Mn(CO),Br (305). The products, (77< -C6H4XC(0) Mn-... 

In another approach, transition metals have been used to stabilize the chemically reactive sesquifulvalene [116, 122]. In an early report, the bimetallic (Fe-Cr) complex was reported to exhibit hyperpolarizabilities up to 570 x 10 ° esu. However, for some other ferrocene derivatives of the sesquifulvalene complexes multi-photon luminescence has been observed which prohibits the determination of the hyperpolarizability by HRS. However, replacement of Fe(II) by Ru(II) results in luminescence-free derivatives [122, 123[. Monometallic manganese(I) sesquifulvalene complexes, on the other hand, are reported to exhibit only modest hyperpolarizabilities [124]. 

Figure 9 Bimetallic model system for cytochrome P-450 composed of a manganese porphyrin and a rhodium(III) bipyridine complex anchored to a vesicle bilayer.

Enzymic photosystems that are employed for the liberation of oxygen from water contain polynuclear complexes with a cubane-like manganese core Mn402, which is immobilized on the protein complex by carboxyl groups. The bimetallic... 

In this paper a study is presented on the preparation of a series of supported catalysts by precipitation of metal cyanide complexes in the presence of suspended supports. As supports alumina, titania, and silica, have been used. The metals studied comprise iron, cobalt, nickel, copper, manganese, palladium, and molybdenum. Both monometallic, bimetallic and even trimetallic cyanides were precipitated. The stoichiometry of the precipitated complexes was controlled by the valency of the metal ions and by using both nitroprusside and cyanide complexes. Electron microscopy was used to evaluate the distribution of the deposited complex cyanides on the supports. 57Fe-M6ssbauer spectra were measured on the dried precipitated complexes to gain information on the chemical composition of the iron containing complexes. 

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