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The title mononickeladodeca­borane cluster, [NiB11H6(OC3H7)5(H2O)2], has been synthesized by the reaction of dichloro­bis(triphenyl­phosphine)nickel(II) with triethyl­ammonium nido-undeca­borane(14) in 2-propanol. The NiIV atom is connected to five atoms of the boron cage to form a closo 12-vertex {NiB11} icosa­hedral skeleton. All of the H atoms on the five B cage atoms connected to the Ni atom are substituted by isoprop­oxy groups. The NiIV atom is also bonded to two water mol­ecules. The mol­ecules form dimers through inter­molecular hydrogen-bond inter­actions.

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The title cluster, [Ru(C7H11B10ClN2O6)(C2H3N)(C18H15P)] or [1,2-{3,5-(NO2)2(C6H3)COO}-1-(PPh3)-1-(CH3CN)-3-Cl-1-RuB10H8], has an iso-closo 11-vertex RuB10 core geometry with the metal occupying the unique six-connected apical position, giving the characteristic 11-vertex iso-closo [MB10] metalloborane 1:2:4:2:2 stack. The ruthenium centre has three exo-polyhedral ligands: one triphenyl­phosphine, one aceto­nitrile and one 3,5-dinitro­benzoate, which is coordinated through Ru—O and B—O bonds, resulting in an exocyclic five-membered Ru/O/C/O/B ring.

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In the title compound, C10H11NO5, all bond lengths and angles show normal values. Weak inter­molecular O—H...O hydrogen bonds form centrosymmetric dimers, which are further linked by π–π inter­actions into ladders extending along the a axis.
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