Analogies between Boron and Carbon

Jemmis, Eluvathingal D.; Jayasree, Elambalassery G.

doi:10.1021/ar0300266

Cited by 105 publications

(57 citation statements)

References 60 publications

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“…1 The transition from two-dimensional to three-dimensional structures is a notable feature of boron chemistry: in the solid state, for instance, MgB 2 is a superconductor 2 with a twodimensional graphite-like (honeycomb) boron layer separated by Mg atoms, MgB 4 is a three-dimensional system based on edge-shared pentagonal pyramides, 3 and MgB 6 is based on octahedral {B 6 } moieties. 4 Here it is noted that the similarity of pentagonal pyramidal [C 6 H 6 ] 2+ and the pentagonal pyramids in solid MgB 4 has been rationalised 5 by means of structural correlations between boron and carbon compounds. 6 Further, the pentagonal pyramidal motif is also that of the binary borane nido-B 6 H 10 , isoelectronic with the [C 6 H 6 ] 2+ dication.…”

Section: Introductionmentioning

confidence: 98%

Borane Polyhedra as Building Blocks for Unknown but Potentially Isolatable New Molecules – Extensions based on Computations of the Known B18H22 Isomers

Oliva¹,

Rué²,

Kennedy³

et al. 2013

Croat. Chem. Acta

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Abstract. Known borane polyhedral cluster characteristics can be used for predicting new architectural constructs. We propose additional structures derived from B 18 H 22 : three positional isomers different from the well-known anti-B 18 H 22 and syn-B 18 H 22 boranes. We have also derived two new cyclic structures based on the condensation of borane pentagonal pyramids and bipyramids. The concatenation of polyhedral borane molecules is also considered from a mathematical point of view.

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Section: Introductionmentioning

confidence: 98%

Borane Polyhedra as Building Blocks for Unknown but Potentially Isolatable New Molecules – Extensions based on Computations of the Known B18H22 Isomers

Oliva¹,

Rué²,

Kennedy³

et al. 2013

Croat. Chem. Acta

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“…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;2002;2003;Balakrishnarajan and Hoffmann, 2004;Jemmis, 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 also 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.…”

Section: Introductionmentioning

confidence: 99%

Unusual underground Capping Carbonyl Clusters of Palladium

Kiremire¹

2016

IJC

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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.Keywords: polyhedral skeletal electron pair theory, palladium capping series, underground capping clusters, clusters of high nuclearity, carbonyls of rhenium, osmium, rhodium, and palladium, hoffmann and isolobal series.

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“…The Wade-Mingos rules have been extremely helpful in deducing the cluster geometries (Mingos, 1984;Wade, 1976;Jemmis, 1984Jemmis, ,2002Jemmis, ,2003Jemmis, ,2005Jemmis, ,2006Jemmis, ,2008King, 2002;Welch, 2013). Furthermore, it has been found that carbonyl clusters and some main group clusters can be categorized using 4n and 14n series (Kiremire, 2014(Kiremire, , 2015.…”

Section: Introductionmentioning

confidence: 99%

The Categorization and Structural Prediction of Transition Metal Carbonyl Clusters Using 14n Series Numerical Matrix

Kiremire¹

2016

IJC

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A matrix table of valence electron content of carbonyl clusters has been created using the 14n-based series. The numbers so generated form an array of series which conform precisely with valence electron contents of carbonyl clusters. The renowned 18 electron rule is a special case of 14n+4 series. Similarly, the 16 electron rule is another special case of the 14n+2 series. Categorization of the carbonyl clusters using the matrix table of series has been demonstrated. The table is so organized that clusters numerically represented can easily be compared and analyzed. The numbers that are diagonally arranged from right to left represent capping series. The row from right to left represents a decrease in valence electron content with increase in cluster linkages. The variation of cluster shapes of constant number of skeletal elements especially four or more may be monitored or compared with the variation with the valence electron content.

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Analogies between Boron and Carbon

Cited by 105 publications

References 60 publications

Borane Polyhedra as Building Blocks for Unknown but Potentially Isolatable New Molecules – Extensions based on Computations of the Known B18H22 Isomers

Borane Polyhedra as Building Blocks for Unknown but Potentially Isolatable New Molecules – Extensions based on Computations of the Known B18H22 Isomers

Unusual underground Capping Carbonyl Clusters of Palladium

The Categorization and Structural Prediction of Transition Metal Carbonyl Clusters Using 14n Series Numerical Matrix

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