National Repository of Grey Literature 12 records found  1 - 10next  jump to record: Search took 0.01 seconds. 
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.
Neočekávaná reakce derivátů closo-thiadodekaboranu s fenylmagnesium bromidem
Císařová, I. ; Fusek, Jiří ; Macháček, Jan ; Plzák, Zbyněk
Derivatives of closo-thiadodecaborane, closo-SB11H11, undergo an unexpected hydrogen substitution under reaction with phenylmagnesium bromide.
Syntéza a přesmyky komplexů přechodných prvků s trikarbollidovými ligandy
Perekalin, DS. ; Holub, Josef ; Štíbr, Bohumil ; Kudinov, AR.
In continuation of the previous studies, we investigated the reactions of tricarbollide anions with various cationic metal-complex fragments. It was shown that the complexation is accompanied by an unusual low-temperature polyhedral rearrangement. Several examples for complexes with the amino-substituted anion are given below.
Supramolekulární variace založené na kobalt bis(dokarbollidovém) iontu(1-)
Grüner, Bohumír ; Mikulášek, Libor ; Báča, Jiří ; Císařová, I. ; Bőhmer, V.
Continuing interest in the development of liquid-liquid extraction and biomedicinal applications of [(1,2-C2B9H11)-3-Co]- anion (1), studied systematically in collaboration with other Groups, prompted us to explore the scope and limitations to create molecular systems containing several hydrophobic anions covalently bound together by simple organic bridging moieties or pre-organized on various supramolecular platforms.

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