[N(CH3)4]4H12Ge9O26.14H2O

Tripathi, Akhilesh; Johnson, Glenn P.; Cahill, Christopher L.; Parise, John B.

doi:10.1107/s0108270198014838

Cited by 11 publications

(4 citation statements)

References 4 publications

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“…The GeO separations are in the same range as those reported for GeO 2 in the quartz modification (1.741 Å) and in other germanates 1–3. 9, 16 The In1 and In2 atoms are coordinated by four oxygen atoms and two nitrogen atoms of the en ligand yielding a strongly distorted octahedral environment. The InO separations range from 2.076(5) to 2.257(4) Å and the InN bond lengths lie between 2.261(7) and 2.285(5) Å.…”

supporting

confidence: 78%

Fragmentation of plumeran indole alkaloids from Aspidosperma spruceanum by electrospray ionization tandem mass spectrometry

Aguiar

Wakabayashi

Luz

et al. 2010

Rapid Comm Mass Spectrometry

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The fragmentation of six plumeran indole alkaloids (PIAs) previously isolated from Aspidosperma spruceanum has been investigated by electrospray ionization tandem mass spectrometry (ESI-MS/MS) in the positive ion mode. The fragmentation pathways have been established on the basis of MS/MS experiments using fragment ions generated in-source and deuterium-labeled alkaloids as precursor ions and on the basis of accurate mass measurements. Our results demonstrated that the fragmentation routes observed for the protonated PIAs are essentially derived from a pericyclic reaction and from the opening of rings D and E, followed by 1,4-hydrogen rearrangements. Product ions resulting from radical eliminations were also observed, contrary to the 'even-electron rule'. Our data reveals that some product ions from protonated PIAs provide crucial information for the characterization of the acyl substituent at N-1, the methoxyl and hydroxyl groups at the aromatic moiety, and give evidence of an ether bridge between C-18 and C-21. The data reported here were used for the dereplication of these compounds in a stem bark methanolic extract of Aspidosperma spruceanum.

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supporting

confidence: 78%

Fragmentation of plumeran indole alkaloids from Aspidosperma spruceanum by electrospray ionization tandem mass spectrometry

Aguiar

Wakabayashi

Luz

et al. 2010

Rapid Comm Mass Spectrometry

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“…More recently, investigations were undergone in the study of the synthesis of germanates, GeO 2 . Since the pioneering work reporting the possibility of making some organically templated open-framework germanates by Xu in the beginning of 1990s, − the research efforts were lately continued with the characterization of several new types of frameworks. − In contrast with silicon, which is usually tetrahedrally coordinated, germanium may adopt three types of coordinations (GeO 4 , tetrahedron, GeO 5 , square pyramid or trigonal bipyramid, and GeO 6 , octahedron) due to its larger atomic radius. It results in longer metal−oxygen distances (≈1.76 Å for Ge−O and ≈1.61 Å for Si−O), which makes possible to have Ge−O−Ge angles smaller than those observed in silicates .…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis and Structural Characterization of a New Organically Templated Germanate, Ge₁₀O₂₁(OH)·N₄C₆H₂₁

2002

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A new open-framework germanium oxide Ge(10)O(21)(OH).N(4)C(6)H(21) has been hydrothermally synthesized at 180 degrees C for 6 days by using the tris(2-aminoethyl)amine (tren) molecule as a structure-directing agent. This compound was characterized by means of single-crystal X-ray diffraction and FTIR. It crystallizes in the noncentric monoclinic system Cm (a = 14.0495(2) A, b = 12.8058(3) A, c = 9.2637(2) A, beta = 128.406(1) degrees, Z = 4). Its three-dimensional framework is built up from GeO(4) and GeO(3)(OH) tetrahedra connected by vertexes to GeO(5) trigonal bipyramids and GeO(6) octahedra. A pseudo-cubic building unit ("4-3" subunit) consists of four GeO(4) tetrahedra, two GeO(5) trigonal bipyramids, and one GeO(6) octahedron (Ge(7)). In the "4-3" block, the GeO(5) trigonal bipyramids share a common edge. This Ge(7) entity is linked to three tetrahedral units GeO(3)X (X = O, OH), and this forms an original decameric building unit Ge(10)O(21)(OH) which is new in the germanates crystal chemistry. It results in a relatively dense open framework composed of pear-shape cavities (7(8)6(2)5(2)4(4)3(2)) encapsulating the triprotonated tren molecule. The inorganic network contains small pores delimited by 7-ring channels running along [001].

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“…These oxo germanium clusters usually occur in covalent germanate frameworks, but examples of oxo germanium clusters with isolated forms are also known. [28,29] The synthesis of germanium frameworks is seldom carried out with isolated oxo germanium clusters as the starting materials. Instead, dense-phase GeO 2 is always used in the solution-mediated synthesis.…”

Section: Introductionmentioning

confidence: 99%

Germanate Frameworks Constructed from Oxo Germanium Cluster Building Units

Lin

Yang

2010

Eur J Inorg Chem

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This article describes the recent research progress in the field of crystalline germanate frameworks with oxo germanium clusters as building units. By using different amine molecules or transition‐metal complexes as the structure‐directing agents, new oxo germanium clusters, such as Ge7, Ge8, Ge9, Ge10, and Ni@Ge14 units, have been prepared and organized into extended frameworks with chain‐like, tubular, layered, slab‐like, and three‐dimensional structures. The combination of different types of oxo germanium clusters in the same crystalline framework provides an additional way to tune the framework structures. Besides their rich structural chemistry, the germanate frameworks exhibit interesting properties including ion‐exchange, microporosity, and thermal stability, suggesting their potential application in molecular sieving and catalysis.

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[N(CH₃)₄]₄H₁₂Ge₉O₂₆^.14H₂O

Cited by 11 publications

References 4 publications

Fragmentation of plumeran indole alkaloids from Aspidosperma spruceanum by electrospray ionization tandem mass spectrometry

Fragmentation of plumeran indole alkaloids from Aspidosperma spruceanum by electrospray ionization tandem mass spectrometry

Hydrothermal Synthesis and Structural Characterization of a New Organically Templated Germanate, Ge₁₀O₂₁(OH)·N₄C₆H₂₁

Germanate Frameworks Constructed from Oxo Germanium Cluster Building Units

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[N(CH3)4]4H12Ge9O26.14H2O

Cited by 11 publications

References 4 publications

Fragmentation of plumeran indole alkaloids from Aspidosperma spruceanum by electrospray ionization tandem mass spectrometry

Fragmentation of plumeran indole alkaloids from Aspidosperma spruceanum by electrospray ionization tandem mass spectrometry

Hydrothermal Synthesis and Structural Characterization of a New Organically Templated Germanate, Ge10O21(OH)·N4C6H21

Germanate Frameworks Constructed from Oxo Germanium Cluster Building Units

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[N(CH₃)₄]₄H₁₂Ge₉O₂₆^.14H₂O

Hydrothermal Synthesis and Structural Characterization of a New Organically Templated Germanate, Ge₁₀O₂₁(OH)·N₄C₆H₂₁