Electronic Requirements for Macropolyhedral Boranes

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

doi:10.1021/cr990356x

Cited by 222 publications

(147 citation statements)

References 300 publications

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“…[13 ϫ 3 (Ga) + 3 (charge) = 42 e -; -12 exo bond e -Ǟ 30 s.e. ], is somewhat more complicated and needs the application of the mno rules of Jemmis et al [41] In the general mno formula: (ii) If the distance between the two cluster fragments is so short, that further bonds between atoms of the two different fragments are formed, the overall system is a giant single deltahedral cage with an atom at the center. In this case, the "connecting" atom is in the center of the large cluster (one "stuffed" atom) and r = 1.…”

Section: Electron Count Using the Mno Rulesmentioning

confidence: 99%

The New Mixed Cluster Trielide K₃Ga_11–xIn_x (x = 1.16–1.36): Synthesis, Crystal Chemistry, and Chemical Bonding

Falk

Meyer

Röhr

2017

Zeitschrift anorg allge chemie

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Abstract. The new cluster compound K 3 Ga 11-x In x , which exhibits a very small In/Ga phase width of x = 1.16 to 1.36 only, was obtained in the course of a systematic synthetic, crystallographic and bond theoretical investigation of mixed potassium trielides of the ternary system K-In-Ga. The compound, which was synthesized from nearly stoichiometric amounts of the elements at a maximum temperature of 500°C, crystallizes in a new orthorhombic crystal structure type [space group Cmmm, a = 1577.9(5), b = 3355.1(8), c = 655.2(2) pm, Z = 10, R 1 = 0.0471]. In the complex polyanion, the triels form two crystallographically different [Ga 12 ] icosahedra, which are present in a 1:2 ratio, and a previously unknown [M 13 ] "double-cluster" consisting of two vertex-sharing [M 7 ] pentagonal bipyramids. All clusters are connected among each other and via a four-bonded pure In and Ga

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Section: Electron Count Using the Mno Rulesmentioning

confidence: 99%

The New Mixed Cluster Trielide K₃Ga_11–xIn_x (x = 1.16–1.36): Synthesis, Crystal Chemistry, and Chemical Bonding

Falk

Meyer

Röhr

2017

Zeitschrift anorg allge chemie

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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 huge variety of crystal structures of bare boron is related to its electron deficiency from which a chemical versatility stems [1][2][3][4][5]. The most important among these crystal structures are the α-and β-rhombohedral boron where the latter is known to be thermodynamically most stable [6].…”

Section: Introductionmentioning

confidence: 99%

Free standing double walled boron nanotubes

Sebetci¹,

Mete²,

Boustani³

2008

Journal of Physics and Chemistry of Solids

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Based on density functional calculations we propose stable structures of free standing double walled boron nanotubes in the form of two single walled boron nanotubes inside one another.Puckering of the boron sheets allows the inner atoms of the outer wall and outer atoms of the inner wall to be matched giving sp-type hybrid σ bonding between the walls. The structural stability, in the case of double walled tubes, increases as the bond interaction between the walls strengthens.All the optimized structures reported in this study are electronically conducting in good agreement with the previously calculated metallic behavior of the experimentally observed single walled boron nanotubes.

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Electronic Requirements for Macropolyhedral Boranes

Cited by 222 publications

References 300 publications

The New Mixed Cluster Trielide K₃Ga_11–xIn_x (x = 1.16–1.36): Synthesis, Crystal Chemistry, and Chemical Bonding

The New Mixed Cluster Trielide K₃Ga_11–xIn_x (x = 1.16–1.36): Synthesis, Crystal Chemistry, and Chemical Bonding

The chemistry of group-VIb metal carbonyls

Free standing double walled boron nanotubes

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Electronic Requirements for Macropolyhedral Boranes

Cited by 222 publications

References 300 publications

The New Mixed Cluster Trielide K3Ga11–xInx (x = 1.16–1.36): Synthesis, Crystal Chemistry, and Chemical Bonding

The New Mixed Cluster Trielide K3Ga11–xInx (x = 1.16–1.36): Synthesis, Crystal Chemistry, and Chemical Bonding

The chemistry of group-VIb metal carbonyls

Free standing double walled boron nanotubes

Contact Info

Product

Resources

About

The New Mixed Cluster Trielide K₃Ga_11–xIn_x (x = 1.16–1.36): Synthesis, Crystal Chemistry, and Chemical Bonding

The New Mixed Cluster Trielide K₃Ga_11–xIn_x (x = 1.16–1.36): Synthesis, Crystal Chemistry, and Chemical Bonding