Abstract
<p>Transition metal carbonyls form unlike boranes a wide range of clusters. High nuclearity carbonyl clusters have a tendency to form capped clusters. Using the method of series explained in this paper, many capped carbonyl clusters have been identified for group 7, 8, 9 and 10 transition metals such as rhenium, osmium, rhodium and palladium. The series have discovered that palladium form exclusively capped carbonyl clusters. Furthermore, it has been discovered that some of the capped clusters have negative nuclear closo function. Such carbonyls have been regarded as capping underground. This paper presents the unique characteristic of high nuclearity capping carbonyl clusters of palladium.</p>
Highlights
The polyhedral skeletal electron pair theory (PSEPT) has been exceedingly useful in categorizing clusters especially boranes and carbonys for many years(Mingos, 1972; Wade, 1976; Cox, 1981; Mingos, 1984;Lee, et al, 1989;Jemmis, et al, 1984;Jemmis et al, 2001; 2002; 2003; Balakrishnarajan and Hoffmann, 2004; Jemmis, 2005; 2005; Wales, 2005; Jemmis, et al, 2008; Welch, 2013)
Using the method of series explained in this paper, many capped carbonyl clusters have been identified for group 7, 8, 9 and 10 transition metals such as rhenium, osmium, rhodium and palladium
This paper presents the unique characteristic of high nuclearity capping carbonyl clusters of palladium
Summary
The polyhedral skeletal electron pair theory (PSEPT) has been exceedingly useful in categorizing clusters especially boranes and carbonys for many years(Mingos, 1972; Wade, 1976; Cox, 1981; Mingos, 1984;Lee, et al, 1989;Jemmis, et al, 1984;Jemmis et al, 2001; 2002; 2003; Balakrishnarajan and Hoffmann, 2004; Jemmis, 2005; 2005; Wales, 2005; Jemmis, et al, 2008; Welch, 2013). In our previous extensive work on clusters we found that the 4n and 14n rules could be utilized to categorize the clusters and predict the shapes carbonyl cluster series (Kiremire, 2014; Kiremire, 2015a; Kiremire, 2015b) especially those of small to medium size level. We found that using 4n series cluster molecular formulas could be decomposed into fragments from which cluster series can be derived and their geometrical shapes predicted Unlike the PSEPT which was derived from molecular orbital theory, the 14n±q and 4n±q (where q is an integer) rules were empirically derived by analysis of carbonyl, hydrocarbons and borane cluster formulas and known shapes
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