2015 Fiscal Year Research-status Report
Pyramidal Structures: New Type of Cluster Compounds
| Project/Area Number |
15K05413
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| Research Institution | University of Tsukuba |
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Principal Investigator |
Lee Vladimir 筑波大学, 数理物質系, 講師 (90375410)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | cluster / group 14 element / group 13 element / group 15 element / housene / pyramidane / cyclobutadiene dianion / X-ray crystallography |
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| Outline of Annual Research Achievements |
In this project we planned to develop a synthetic route to new class of polyhedral clusters, pyramidal compounds of the heavy main group elements.
Such pyramidanes, representing metal-rich organometallic compounds, are very promising objects for material and applied science as the precursors for ceramic composites and nanostructures (nanoparticles, nanocrystals, nanowires).
As was initially planned, during the first year of this project we succeeded in the preparation of unprecedented pyramidanes of the group 14 elements. As the precursors for pyramidanes, we used cyclobutadiene dianion, tetrasilacyclobutadiene dianion, and tetragermacyclobutadiene dianion derivatives, recently developed in our group. The reaction of these dianions with :EX2-diox (E = heavy group 14 element) complexes provided the desired pyramidal compounds.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
All research targets and plans of the first year of this project were successfully achieved, using the originally proposed synthetic strategy: coupling reaction of the cyclobutadiene dianion derivatives and heavy carbene analogues :EX2 (E = heavy group 14 element). Namely, a whole series of heteronuclear piramidanes with the heavy group 14 elements at the apex or at the base of the square pyramid, or even homonuclear pyramidanes entirely consisting of identical group 14 elements, was synthesized, structurally characterized, and computationally studied.
Thus, the project is going quite well within the first year of project without any troubles, in complete accord with the initially proposed schedule.
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| Strategy for Future Research Activity |
In the second year of the project, we will expand the series of pyramidanes to include their new members with the group 15 or group 13 elements at the apex of the square pyramid. Group 15 element pyramidanes are expected to be cationic derivatives, whereas group 13 element pyramidanes should be anionic compounds. After the synthesis of such pyramidal clusters, we will optimize the reaction conditions (reagents, solvents, temperature, etc.) to maximize the yields of the products. The newly prepared compounds will be fully characterized and computationally studied to reveal their peculiar bonding features.
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| Causes of Carryover |
During the first year of the project, chemical equipment was originally planned to be purchased, however the experimental work was performed without using such equipment. Therefore, we did not purchase such equipment, and accordingly some amount of money remained after completing the first year of the project.
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| Expenditure Plan for Carryover Budget |
The amount of money remained after the first year of the project will be used to purchase the chemical equipment which will be necessary to perform the experimental work planned for the second year of the project. The successful realization of the research plan for the second year of the project requires the use of such equipment.
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[Presentation] Cationic Pyramidanes2015
Author(s)
H. Sugasawa, Y. Ito, V. Ya. Lee, A. Sekiguchi, O. A. Gapurenko, R. M. Minyaev, V. I. Minkin
Organizer
The 42nd Symposium on Main Group Element Chemistry
Place of Presentation
Aichi, Nagoya, Nagoya University
Year and Date
2015-12-03 – 2015-12-05
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[Presentation] Raman Study of Organometallics of a Novel Class Pyramidanes E[C4(SiMe3)4], E = Ge, Sn, Pb2015
Author(s)
L. A. Leites, R. R. Aysin, S. S. Bukalov, V. Ya. Lee, H. Sugasawa, A. Sekiguchi
Organizer
International Conference “Organometallic and Coordination Chemistry: Achievements and Challenges”
Place of Presentation
Russia, Nizhny Novgorod, University
Year and Date
2015-09-18 – 2015-09-23
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[Presentation] Pyramidanes: the Covalent Form of an Ionic Compound.2015
Author(s)
V. Ya. Lee, O. A. Gapurenko, Y. Ito, T. Meguro, H. Sugasawa, A. Sekiguchi, R. M. Minyaev, V. I. Minkin, H. Gornitzka, R. Herber
Organizer
14th International Symposium on Inorganic Ring Systems (IRIS-14)
Place of Presentation
Germany, Regensburg, University of Regensburg
Year and Date
2015-07-26 – 2015-07-31
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[Presentation] Group 14 Element Pyramidanes: Theoretical Studies.2015
Author(s)
O. A. Gapurenko, V. Ya. Lee, R. M. Minyaev, V. I. Minkin, Y. Ito, T. Meguro, H. Sugasawa, A. Sekiguchi
Organizer
14th International Symposium on Inorganic Ring Systems (IRIS-14)
Place of Presentation
Germany, Regensburg, University of Regensburg
Year and Date
2015-07-26 – 2015-07-31
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[Presentation] Silicon-Containing Pyramidanes2015
Author(s)
O. A. Gapurenko, V. Ya. Lee, T. Meguro, R. M. Minyaev, V. I. Minkin, A. Sekiguchi
Organizer
XIIIth Andrianov Conference “Organosilicon Compounds: Synthesis, Properties, Applications”
Place of Presentation
Russia, Moscow, Institute of Organoelement Compounds
Year and Date
2015-06-28 – 2015-07-01
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