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Cluster Units (cluster + unit)
Selected AbstractsA New 2-D Network Containing {As4V16O42(H2O)} Cluster UnitsEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 34 2009Jian Zhou Abstract A new polyoxometalate [Cd(dien)]2[Cd(dien)(H2O)]2[As4V16O42(H2O)]·2H2O (1, dien = diethylenetriamine) has been hydrothermally synthesized and structurally characterized. 1 is the first example of 2-D network based on the linkages of the rare {As4V16O42(H2O)} cluster units and two types of cadmium(II) complex fragments. The magnetic susceptibility shows the antiferromagnetic interaction between VIV cations in 1. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source] Planar Fe6 Cluster Units in the Crystal Structure of RE15Fe8C25 (RE=Y, Dy, Ho, Er),ANGEWANDTE CHEMIE, Issue 33 2010Bambar Davaasuren Neuigkeiten von Fe-C: Die ternären Seltenerd-Titelverbindungen enthalten planare (magnetische) Fe6 -Cluster, die durch Fe(C2)3 -Einheiten zu polymeren Carboferrat-Komplexen verbunden sind (siehe Strukturausschnitt; rot Fe, schwarz C). Die Fe6 -Cluster können als Fragmente von ,-Fe und binären Eisencarbiden angesehen werden. Die ternären Verbindungen enthalten kovalente Fe-Fe-, polare dative Ligand(C2),Metall(Fe)- und Fe,RE-Wechselwirkungen. [source] Unprecedented Association of [Mo6Bri7YiBra6]3, Cluster Units and [MoIIIBr6]3, Complexes: Synthesis, Crystal Structures, and Properties of the Double Salts Rb3[Mo6Bri7YiBra6](Rb3[MoBr6])3 (Y=Se, Te)CHEMISTRY - A EUROPEAN JOURNAL, Issue 24 2006Kaplan Kirakci Abstract The double salts Rb3[Mo6Bri7YiBra6](Rb3[MoBr6])3 (Y=Se, Te) result from the partial disproportionation of the Mo6Br12 octahedral-cluster-based bromide, in the presence of corresponding chalcogenides and RbBr salt (crystal data: Rb12[MoBr6]3[Mo6Bri7TeiBra6] (1), Pmm (No. 221), a=12.1558(2) Å, Z=1, R1=0.028; wR2=0.050; Rb12[MoBr6]3[Mo6Bri7SeiBra6] (2), Pmm, a=12.144(3) Å, Z=1, R1=0.028; wR2=0.050). The structures of 1 and 2 are built up from [MoIIIBr6]3, complexes and [Mo6Bri7YiBra6]3, cluster units characterised by a random distribution of seven bromine and one chalcogen ligands on all the eight inner positions that face cap the Mo6 clusters. Such a distribution implies a static orientational disorder of the [Mo6Bri7YiBra6]3, units around the origin of the unit cell. Close-packed anionic layers based on [MoIIIBr6]3, complexes and [Mo6Bri7YiBra6]3, cluster units are stacked in the sequence ABC. This arrangement leads to very short BraBra intercluster unit distances of 3.252 Å, much lower than the sum of the van der Waals radii (3.70 Å). The trivalent oxidation state of molybdenum in the Mo complexes and 24 valence electrons per Mo6 cluster have been confirmed by magnetic susceptibility measurements. Salts 1 and 2 constitute the first examples of structurally characterised bromides containing discrete [MoIIIBr6]3, complexes obtained by means of solid-state synthesis. [source] Cs2Mo15S19: a novel ternary reduced molybdenum sulfide containing Mo6 and Mo9 clustersACTA CRYSTALLOGRAPHICA SECTION C, Issue 6 2004S. Picard The crystal structure of dicaesium pentadecamolybdenum nonadecasulfide, Cs2Mo15S19, consists of a mixture of Mo6S8S6 and Mo9S11S6 cluster units in a 1:1 ratio. Both units are interconnected via inter-unit Mo,S bonds. The Cs+ cations occupy large voids between the different cluster units. The Cs and two inner S atoms lie on sites with 3 symmetry (Wyckoff site 12c) and the Mo and S atoms of the median plane of the Mo9S11S6 cluster unit on sites with 2 symmetry (Wyckoff site 18e). [source] A New 2-D Network Containing {As4V16O42(H2O)} Cluster UnitsEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 34 2009Jian Zhou Abstract A new polyoxometalate [Cd(dien)]2[Cd(dien)(H2O)]2[As4V16O42(H2O)]·2H2O (1, dien = diethylenetriamine) has been hydrothermally synthesized and structurally characterized. 1 is the first example of 2-D network based on the linkages of the rare {As4V16O42(H2O)} cluster units and two types of cadmium(II) complex fragments. The magnetic susceptibility shows the antiferromagnetic interaction between VIV cations in 1. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source] Construction of 1D and 2D Copper(I) Coordination Polymers Assembled by PhS(CH2)nSPh (n = 1, 2) Dithioether Ligands: Surprising Effect of the Spacer Length on the Dimensionality, Cluster Nuclearity and the Fluorescence Properties of the Metal,Organic Framework,EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 13 2007Harmel N. Peindy Abstract Treatment of CuI with PhSCH2SPh in MeCN solution affords, by a self-assembly reaction, the monodimensional metal,organic coordination polymer [Cu4I4{,-PhS2CH2SPh}2]n (1), in which Cu4(,3 -I)4 cluster units are linked by the dithioether ligand in a 1D necklace structure. In contrast, the reaction of PhSCH2CH2SPh with CuI results in the formation of the metallopolymer [(CuI)2{,-PhS(CH2)2SPh}2]n (2). The 2D network of 2 is built from dimeric Cu2I2 units which are connected by 1,2-bis(phenylthio)ethane bridging ligands. The solid-state luminescence spectrum of 1 exhibits a strong emission around 532 nm, whereas a weak emission centred at 413 nm is observed in the case of 2. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source] Ag2.54Tl2Mo12Se15: a new structure type containing Mo6 and Mo9 clustersACTA CRYSTALLOGRAPHICA SECTION C, Issue 6 2010P. Gougeon The novel structure-type Ag2.54Tl2Mo12Se15 (silver thallium molybdenum selenide) is built up of Mo6Sei8Sea6 and Mo9Sei11Sea6 cluster units in a 1:2 ratio, which are three-dimensionally connected to form the Mo,Se network. The Ag and Tl cations are distributed in several voids within the cluster network. Three of the seven independent Se atoms and one Tl atom lie on sites with 3.. symmetry (Wyckoff sites 2c or 2d). [source] Cr1.45Tl1.87Mo15Se19, a monoclinic variant of the hexagonal In3Mo15Se19 typeACTA CRYSTALLOGRAPHICA SECTION C, Issue 12 2009P. Gougeon The monoclinic compound Cr1.45Tl1.87Mo15Se19 (chromium thallium pentadecamolybdenum nonadecaselenide) represents a variant of the hexagonal In3Mo15Se19 structure type. Its crystal structure consists of an equal mixture of Mo6Se8Se6 and Mo9Se11Se6 cluster units. The Mo and Se atoms of the median plane of the Mo9Se11Se6 unit, as well as three Cr ions, lie on sites with m symmetry (Wyckoff site 2e). The fourth Cr ion is in a 2b Wyckoff position with site symmetry. [source] Poly[[(pentaethylenehexamine)manganese(II)] [hepta-,-selenido-tritin(IV)]]: a tin,selenium net with remarkable flexibilityACTA CRYSTALLOGRAPHICA SECTION C, Issue 5 2009Guo-Hai Xu The title compound, {[Mn(C10H28N6)][Sn3Se7]}n, consists of anionic ,{[Sn3Se7]2,} layers interspersed by [Mn(peha)]2+ complex cations (peha is pentaethylenehexamine). Pseudocubic (Sn3Se4) cluster units within each layer are held together to form a 63 net with a hole size of 8.74 × 13.87,Å. Weak N,H...Se interactions between the host inorganic frameworks and metal complexes extend the components into a three-dimensional network. The incorporation of metal complexes into the flexible anion layer dictates the distortion of the holes. [source] Cs2Mo15S19: a novel ternary reduced molybdenum sulfide containing Mo6 and Mo9 clustersACTA CRYSTALLOGRAPHICA SECTION C, Issue 6 2004S. Picard The crystal structure of dicaesium pentadecamolybdenum nonadecasulfide, Cs2Mo15S19, consists of a mixture of Mo6S8S6 and Mo9S11S6 cluster units in a 1:1 ratio. Both units are interconnected via inter-unit Mo,S bonds. The Cs+ cations occupy large voids between the different cluster units. The Cs and two inner S atoms lie on sites with 3 symmetry (Wyckoff site 12c) and the Mo and S atoms of the median plane of the Mo9S11S6 cluster unit on sites with 2 symmetry (Wyckoff site 18e). [source] Potassium yttrium hexaniobium octadecachloride, KYNb6Cl18ACTA CRYSTALLOGRAPHICA SECTION C, Issue 4 2003Thirumalai Duraisamy The structure of potassium yttrium hexaniobium octadecachloride is built of anionic [Nb6Cl12iCl6a]4, cluster units (where `i' and `a' denote inner and outer ligands, respectively), linked together by K+ and Y3+ cations. The K+ cations occupy half of the tetrahedral vacancies in the face-centered cubic lattice of cluster units, and are coordinated by 12 chloride ligands. The Y atom is located in an octahedral site and is bonded to six outer chloride ligands. [source] Unprecedented Association of [Mo6Bri7YiBra6]3, Cluster Units and [MoIIIBr6]3, Complexes: Synthesis, Crystal Structures, and Properties of the Double Salts Rb3[Mo6Bri7YiBra6](Rb3[MoBr6])3 (Y=Se, Te)CHEMISTRY - A EUROPEAN JOURNAL, Issue 24 2006Kaplan Kirakci Abstract The double salts Rb3[Mo6Bri7YiBra6](Rb3[MoBr6])3 (Y=Se, Te) result from the partial disproportionation of the Mo6Br12 octahedral-cluster-based bromide, in the presence of corresponding chalcogenides and RbBr salt (crystal data: Rb12[MoBr6]3[Mo6Bri7TeiBra6] (1), Pmm (No. 221), a=12.1558(2) Å, Z=1, R1=0.028; wR2=0.050; Rb12[MoBr6]3[Mo6Bri7SeiBra6] (2), Pmm, a=12.144(3) Å, Z=1, R1=0.028; wR2=0.050). The structures of 1 and 2 are built up from [MoIIIBr6]3, complexes and [Mo6Bri7YiBra6]3, cluster units characterised by a random distribution of seven bromine and one chalcogen ligands on all the eight inner positions that face cap the Mo6 clusters. Such a distribution implies a static orientational disorder of the [Mo6Bri7YiBra6]3, units around the origin of the unit cell. Close-packed anionic layers based on [MoIIIBr6]3, complexes and [Mo6Bri7YiBra6]3, cluster units are stacked in the sequence ABC. This arrangement leads to very short BraBra intercluster unit distances of 3.252 Å, much lower than the sum of the van der Waals radii (3.70 Å). The trivalent oxidation state of molybdenum in the Mo complexes and 24 valence electrons per Mo6 cluster have been confirmed by magnetic susceptibility measurements. Salts 1 and 2 constitute the first examples of structurally characterised bromides containing discrete [MoIIIBr6]3, complexes obtained by means of solid-state synthesis. [source] | ||||||||||