A Unifying Electron-Counting Rule for Macropolyhedral Boranes, Metallaboranes, and Metallocenes

Jemmis, Eluvathingal D.; Balakrishnarajan, Musiri M.; Pancharatna, Pattath D.

doi:10.1021/ja003233z

Cited by 205 publications

(163 citation statements)

References 111 publications

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“…The mno rule 43 Applied to New Cyclic Structures B 40 H 40 6 and B 50 H 30 7 A structure-electron-counting correlation, the so-called mno 'rule', can be used in macropolyhedral boroncontaining molecules to correlate the cluster structures with the formal cluster electron-counts, and it is of interest to consider this approach in relation to the neutral charges of the computed macrocyclic macropolyhedral species B 40 H 40 6 and B 50 H 30 7. In the mno concept, m represents the number of polyhedra, n is related to the number of vertices, and o is the number of singlevertex-sharing condensations.…”

Section: Mathematical Considerations For Extension Of Borane Moleculementioning

confidence: 99%

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: Mathematical Considerations For Extension Of Borane Moleculementioning

confidence: 99%

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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“…Recently these rules are extended and unified for macropolyhedral boranes, metallocenes and borides. The unified electron counting rules are called Jemmis mno rules [216][217].…”

Section: Predicting Structures Of Cluster Compoundsmentioning

confidence: 99%

The chemistry of group-VIb metal carbonyls

Kaushik¹,

Singh²,

Kumar³

2012

Eur. J. Chem.

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KEYWORDSThe special interest attached to the chemistry of metal carbonyls arises from several causes. While quite distinct from the metal carbonyls in the organometallic compounds, they differ in physical properties (e.g., their volatility) from all other compounds of the transition metals. Chemically, they constitute a group of compounds in which the formal valency of the metal atoms is zero, and in this respect (apart, perhaps, from the ammoniates of the alkali metals) they are comparable only with the recently discovered compounds. As a class, the carbonyls are reactive compounds, and a number of new types of inorganic compounds have been discovered. In the concepts for new products, performance, product safety, and product economy criteria are equally important. They are taken into account already when the raw material base for a new industrial product development is defined. Since the discovery of nickel carbonyl by Mond and Langer in 1888, the carbonyls of the iron group and of chromium, molybdenum and tungsten have found important technical applications, e.g., in the Mond nickel process, and for the preparation of the metals in a state of subdivision and of purity suitable for powder metallurgy, for catalysts, etc. The reaction mechanism of the processes developed for producing the carbonyls technically has only recently received its interpretations. Within the space of review it is necessary to limit discussion to a few topics. Particular stress has accordingly laid upon (a) the chemical bonding in metal carbonyls, (b) importance of IR and NMR spectroscopy in characterization of metal carbonyls, (c) substitution reactions of G-VIb metal carbonyls, (d) kinetics and mechanism of substitution reactions in metal carbonyls, (e) substituted complexes of G-VIb metal carbonyl, (f) chelate complexes of G-VIb metal carbonyls, (g) uses of G-VIb metal carbonyl complexes and (h) studies done on G-VIb metal carbonyls.

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“…The method highly complements Wade-Mingos rules which have been in existence for more than forty years (Wade, 1991;Mingos, 1972Mingos, , 1984Mingos, , 1991.Other methods for dealing with electron counting in clusters have been devised (Lipscomb, 1976;King, 1986aKing, , 1986bJensen, 1978;Teo, et al, 1984;Wales, 2005;Wheeler and Hoffmann, 1986;Jemmis, et al, 2000Jemmis, et al, , 2001aJemmis, et al, , 2001b. However on closer scrutiny of the 4n series method, it has become apparent that we could go further and assign skeletal linkage numbers to elements and ligands which greatly simplifies the prediction of structures of molecules and clusters.…”

Section: Introductionmentioning

confidence: 99%

A Hypothetical Model for the Formation of Transition Metal Carbonyl Clusters Based upon 4n Series Skeletal Numbers

Kiremire¹

2016

IJC

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Skeletal numbers of elements have been introduced as derivatives of the 4n series method. They are based on the number of valence electrons present in the skeletal element. They are extremely useful in deducing possible shapes of skeletal elements in molecules or clusters especially the small to medium ones. For large skeletal clusters, the skeletal numbers may simply be regarded as identity numbers. In carbonyl clusters, they can be used as a guide to facilitate the distribution of the ligands such as CO, H and charges onto the skeletal atoms. A naked skeletal cluster may be viewed as a reservoir for skeletal linkages which get utilized when ligands or electrons get bound to it. The sum of linkages used up by the ligands bound to a skeletal fragment and the remaining cluster skeletal numbers is equal to the number of the skeletal linkages present in the original "naked parent" skeletal cluster. The skeletal numbers can be used as a quick way of testing whether or not a skeletal atom obeys the 8-or 18-electron rules.

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A Unifying Electron-Counting Rule for Macropolyhedral Boranes, Metallaboranes, and Metallocenes

Cited by 205 publications

References 111 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

The chemistry of group-VIb metal carbonyls

A Hypothetical Model for the Formation of Transition Metal Carbonyl Clusters Based upon 4n Series Skeletal Numbers

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