Premium
Cover Picture (Angew. Chem. Int. Ed. Engl. 3/1992)
Publication year - 1992
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199202471
Subject(s) - crystallography , cover (algebra) , manganese , bipyramid , atom (system on chip) , planarity testing , chemistry , ring (chemistry) , indium , square pyramid , trigonal bipyramidal molecular geometry , physics , stereochemistry , crystal structure , computer science , mechanical engineering , organic chemistry , engineering , embedded system
The cover picture shows the aesthetically pleasing structure of the highly symmetrical dianion [(μ 5 ‐In){Mn(CO) 4 } 5 ] 2− . Five manganese atoms (red) form a five‐membered ring, which is slightly distorted from planarity towards an envelope configuration. Each manganese atom is approximately octahedrally surrounded by two axial and two equatorial carbonyl groups (C atoms green, O atoms blue), and two neighboring manganese atoms. In the middle of these cyclo ‐[Mn 5 (CO) 20 ] “ligands”, like a spider in its web, lies an indium atom, which forms bonding interactions with every Mn atom. This pentagonal‐planar coordination usually has a substantially less favorable energy than the trigonal‐bipyramidal or square‐pyramidal coordination. Till now it has only been observed when it could be interpreted as a pseudo‐pentagonal‐bipyramid. M. Schollenberger, B. Nuber, and M. L. Ziegler report this unusual coordination compound on p. 350ff. No less exciting is the structure of [Ni(P t Bu) 6 ], which contains a Ni atom in a hexagonal‐planar environment, reported by R. Ahlrichs, D. Fenske, H. Oesen, and U. Schneider on p. 323ff.