Cobalt-centred boron molecular drums with the highest coordination number in the CoB16− cluster

Cobalt-centred boron molecular drums with the highest coordination number in the CoB16− cluster

The electron deficiency and strong bonding capacity of boron have led to a vast variety of molecular structures in chemistry and materials science. Here we report the observation of highly symmetric cobalt-centered boron drum-like structures of CoB16(-), characterized by photoelectron spectroscopy and ab initio calculations. The photoelectron spectra display a relatively simple spectral pattern...

Cobalt-centred boron molecular drums with the highest coordination number in the CoB16â‹TM cluster

On the way to the highest coordination number in the planar metal-centred aromatic Ta©B10- cluster: evolution of the structures of TaB(n)- (n = 3-8).

The structures and chemical bonding of TaB(n)(-) (n = 3-8) clusters are investigated systematically to elucidate the formation of the planar metal-centred aromatic borometallic cluster, Ta©B10(-) (the © sign is used to designate the central position of the doped atom in monocyclic structures in M©B(n)-type planar clusters), which was found previously to have the highest coordination number for ...

the u.s. policy in central asia and its impact on the colored revolutions in the region (the case study of tulip revolution in kyrgyzstan)

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the effect of task cognitive complexity and time limit on the performance of the learners with different proficiency levels in second language writing skill

this study investigated the effects of manipulating the cognitive complexity of tasks along +/- few elements and the time limits on l2 learners writing performance. to conduct the study, 60 iranian efl learners with two levels of proficiency, low and high intermediate, were selected and assigned to three groups based on the time devoted to task completion. the participants performed both a simp...