In their highest oxidation states the early transition metals V, Nb, Ta, Mo, W, and Re form tetrahedral, strongly colored thioanions endowed with some remarkable properties. Thiometalates can be formed by solid-state reactions or in solution from the oxometalates. Polythiometalates with mixed valences can be produced by new types of intramolecular condensation-redox reactions from thioanions. The metal-sulfur bonds can react either nucleophilically or electrophilically, and in the case of the Mo-S bonds this is of biochemical interest. It is important to mention the applications of thiometalates as ligands in complex chemistry (generation of multi-metal complexes, versatile coordination behavior, unique electronic properties of the ligands), in which thiometalato complexes with a variety of electron populations can exist because of the marked electron delocalization. Apart from this, MoSihas a significance in bioinorganic problems, e.g. the nitrogenase problem and Cu-Mo antagonism. 0 Verlag Chemie GmbH. 6940 Weinheim, 057O-0833/81/1111-0934 $02.50/0 Angew. Chem. Int. Ed. Engl. 20, 934-955 (1981) [*' I Microbial Degradation of Chlorinated Arenes, Part 7.-Part 6: [2c]. Angew. Chem. Int. Ed. Engl. 20 (1981) No. I 1 0 Verlag Chemie GrnbH, 6940 Weinheirn. I981 0570-0833/81/II11-0955 $ 02.50/0

Trinuclear clusters of the early transition elements, i. e. those elements situated on the left-hand side of the transition series, represent the simplest types of clusters. They characteristically have a pronounced formation tendency and high stability; they are therefore produced under a wide variety of conditions and their triangular M, skeleton is conserved in ligand exchange reactions. These clusters play a very important role in the chemistry of the respective elements, and especially those of the 4 d and 5 d series. Biochemical implications are of interest in connection with MoIV. This progress report presents a systematic account of the chemistry and the molecular and electronic structure of such compounds. A connection is also established with the crystal field treatment of mononuclear metal complexes.

Spektroskopische (IR, RA, Elektronenabsorption, PE) Eigenschaften der Cyanothiomolybdate (I)‐(IV), die möglicherweise biologische Bedeutung haben, werden untersucht und auf der Grundlage von EH‐SCCC‐MO‐Berechnungen diskutiert.

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Professor Oskar Glemser zum 70. Geburtstag gewidmet