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Structural stury of carboranes by mass spectrometry
Navrátilová, Romana ; Vávrová, Milada (referee) ; Čáslavský, Josef (advisor)
Boron cluster compounds are substances clearly synthetic, which don't exist outdoors. This group covers boranes, heteroboranes and their derivatives. They are synthesized and examined mostly for their extraordinary structural and bonding properties. Their study also brought many remarkable findings and even allowed practical use of these compounds in science and technology. This thesis is focused on the application of mass spectrometry for the identification of boranes and heteroboranes and on the study of their fragmentation mechanisms using tandem mass spectrometry on spherical ion trap.
Synthesis of novel C-(o-carboranyl)-2-deoxy-d-ribose conjugates
Šnajdr, I. ; Janoušek, Z. ; Kotora, Martin
Carboranes are clusters consisting of carbon, boron and hydrogen and because they have high percent of boron by weight, they are used as 10B carriers for cancer therapy (boron neutron capture therapy, BNCT). Therefore a series of novel o-carboranyl-deoxyribose conjugates as water soluble substances has been synthesized.
Novinky v chemii trikarbollidových komplexů [9-R-2-(.eta.-C5H5)-2,1,7,9-FeC3B8H10]
Grüner, Bohumír ; Mikulášek, Libor ; Císařová, I. ; Štíbr, Bohumil
The resulting 12-vertex open-cage nido dianion 2 is very reactive and prone to a variety of reaction, serving thus as a valuable source of stable matallatricarbollides, inclusive of new supracosahedral clusters.
Nový typ klecové struktury : první jedenáctivrcholový trikarbaborán hypho-[C3B8H15](-)
Londesborough, Michael Geoffrey Stephen ; Janoušek, Zbyněk
The polyhedral geometries that the majority of boranes adopt are related to the number of electron pairs available to it for cluster bonding, a relationship that has allowed the classification of boron-containing clusters into the closo, nido, arachno, etc "families" that we are all familiar with.
Jedenáctivrcholová difosfakarboranová chemie
Bakardjiev, Mario ; Holub, Josef ; Carr, MJ. ; Hnyk, Drahomír ; Kennedy, JD. ; Štíbr, Bohumil
The molecular geometries of the non metallic compounds were optimized ab initio at a correlated level of theory (RMP2(fc))/6-31G* and the structure of 4 was determined by an X-ray diffraction analysis.
(Tetramethylcyklobutadien)kobaltové komplexy s fosfadikarbollidovými a trikarbollidovýmy ligandy
Mutseneck, EV. ; Holub, Josef ; Petrovskii, PV. ; Starikova, ZA. ; Zanello, P. ; Štíbr, Bohumil ; Kudinova, AR.
(Cyclopentadienyl)iron complexes with phosphadicarbollide and tricarbollide ligands have been prepared recently.
Chemie "helmet" aniontu : hypho--[C2B6H13](-)
Londesborough, Michael Geoffrey Stephen ; Janoušek, Zbyněk ; Hnyk, Drahomír ; Štíbr, Bohumil
The geometries and electron-counts of the vast majority of known carborane species fall under the structural catagories of closo, nido and arachno carboranes.
Postupná degradace dekaboranu na malé monokarbaboranové sloučeniny
Holub, Josef ; Bakardjiev, Mario ; Hnyk, Drahomír ; Štíbr, Bohumil
How much difficult is the life of a boron-cluster chemist wanting to prepare smaller-cage monocarboranes from the commercially available decaborane is demonstrated by the Scheme.
Inzerce síry do malých karbaboranů a inzerce uhlíku do thiaboranů
Jelínek, Tomáš ; Holub, Josef ; Štíbr, Bohumil
The reaction between elemental sulphur and smaller carbaboranes, such as arachno-4-CB8H14, arachno-4,5-C2B7H13, and range of other carbaboranes, provide a wide variety of products engendered from the simple insertion of sulphur into their skeletons.
Stereochemie karboranů vznikajících sedmistupňovou degradací dekaboranu
Hnyk, Drahomír ; Štíbr, Bohumil
The final level of geometry optimizations of these clusters of various molecular shapes included the effect of electron correlation, which considerably improved the fit between the calculated (GIAO-SCF or GIAO-MP2) and experimental 11B chemical shifts.

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