Heteroatom cluster compounds, with

Ralph Rudolph made major contributions to our understanding of the structure and bonding of polyhedral cluster compounds and he had an abiding interest in developing a rationale which would enable the structure of individual compounds to be systematized and related to each other. He independently arrived at a method of counting skeletal electrons which is now generally referred to as Wade s Rules, and this has had a decisive influence on our general perceptions of polyhedral cluster compounds. Related to this was his preoccupation with the problem of heteroatoms such as sulfur, and the number of electrons which such atoms contribute to the heteroborane clusters. 

Trigonal prismatic structures are not found very often in simple hexanuclear clusters. Most compounds with this metal atom arrangement are carbides and nitrides in which the heteroatom occupies the center of the prism. 

Iron Cluster Compounds Compounds with Fe-C Bonds to Heteroatom Ligands... 

Aromaticity is a qualitative phenomenon, which is of utmost importance in the wide realm of chemistry [1], Prior to the discovery of benzene by Michael Faraday as early as 1825 [2], the compounds with a distinctive smell or aroma were found to be quite stable and were usually known by the name aromatic compounds. Soon after the discovery of benzene, this phenomenon has gained a tranendous impetus. With the discovery of new molecules exhibiting aromatic or antiaromatic behavior, the impetus has gained a further momentum in research [3]. The concept of aromaticity has earlier been confined to hydrocarbon systems only however, the modem era has also witnessed its importance among the heteroatomic systems as well [4]. Several such systems with o-electronic framework have attracted much attention. Moreover, innovation of metal clusters with d-orbital aromaticity is also very... 

Borane Clusters with Croup 15 and Croup 16 Heteroatoms Survey of Compounds and Structures... 

---