Ingrid Fischler

Photochemische synthese von 1,3-dientetracarbonylchromkomplexen und ihre rolle bei der photokatalytischen hydrierung von diene mit Cr(CO)6

The photochemical synthesis of butadienetetracarbonylchromium (I) and trans,trans-2,4-hexadienetetracarbonylchromium (II) is described. II is shown to be an intermediate in the photocatalytic hydrogenation of trans,trans-2,4-hexadiene with Cr(CO)6.

Aspects of Organo-Transition-Metal Photochemistry and their Biological Implications

Publisher Summary Photochemistry is the study of chemical changes brought about by light. It encompasses all processes “participating in the formation and deactivation of electronically excited molecules”. Some of its aspects may be considered as photophysics, some as photobiology; however, any arbitrary demarcation would not be in accord with the interdisciplinary character of this field. It is considered that organmetallic chemistry is the chemistry of compounds, in which metals are bound to groups or molecules that are under the regime of organic chemistry. One does make any distinction whether bonding occurs via carbon or another element, as for instance N, P, O, or S. In many transformations of organic material involving metals, the site of bonding and the primary reactive steps remain obscure anyhow. Organometallic compounds are often made from “inorganic’’ starting materials, are applied in organic syntheses, and play a significant role in biochemistry.

Photochemische synthese von H2Fe3-komplexen und ihre aktivität bei der photokatalytischen hydrierung von olefinen und dienen

Abstract The photochemical reaction of the trinuclear complex Fe 3 (CO) 10 NSi(CH 3 ) 3 under hydrogen leads to substitution of the bridging carbonyl group by two hydrogens. The resulting complex H 2 Fe 3 (CO) 9 NSi(CH 3 ) 3 acts as a catalyst in the photochemical hydrogenation of olefins and dienes.

Chemische und biologische Aspekte der Fixierung und Reduktion molekularen Stickstoffs

The fixation and reduction of molecular nitrogen in transition-metal complexes is one of the most fascinating areas of current research. In the hope of cata!yzing further progress, a brief survey is given of some aspects of this rapidly developing field: historical background; methods of preparation of metal-N~ complexes; bonding in metal-N2 complexes; reactivity of complexed N2; models for nitrogenase; further routes for the reduction of complexed N v A few speculative suggestions are put forward to stimulate further discussion.

Photoinduzierte addition von R3SiH an (η4-butadien)tricarbonyleisen

Abstract Irradiation of a mixture of 1,3-dienes, silanes, and pentacarbonyliron leads to mixtures of isomeric hydrosilylation products. The reaction is shown to proceed via the intermediate formation of (η 3 - anti -butenyl)tricarbonyliron-trialkylsilicon complexes which are accessible by photoinduced addition of R 3 SiH to (η 4 -butadiene)tricarbonyliron and, upon thermal decomposition, yield similar mixtures of isomeric butenyltrialkyisilicon derivatives.