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Compound 1 crystallises in the monoclinic space group P2 1 /c (Fig. 1). All four Ni(II) centres have a distorted octahedral geometry: Ni1 and Ni2 are in an { N 2 O 4 } environment from the Bis- tris propane ligand while Ni3 and Ni4 are bound by four oxygen donor atoms from the ligand arms and two oxygen donor atoms from the 1,3-chelating acac ligands. Each Bis-tris propane ligand displays the same binding mode h 3 :h 3 :h 1 :h 1 :h 1 :h 1 :m 4 (Fig. 2) but exists in either the di- or tri-anionic form. The ¡®extra¡¯ ligand OH proton lies along the short O8¨CH8¨CO6 hydrogen bond (2.48 A˚ ). The distorted Ni 4 cubane is a monocation, with charge balance afforded by a lattice acetate anion. Although the Ni 4 cubane represents a common topology, cubanes where one ligand binds to all four Ni(II) centres (Fig. 2) are almost unheard of. 11 In the case of 1, the m 4 ligand binding results in two different ¡®upper¡¯ (Ni1, Ni2) and ¡®lower¡¯ (Ni3, Ni4) faces, providing scope for facile removal of the two acac ligands and hence, future use as a synthetic precursor to larger complexes. |
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°®ÓëÓêÏÂ(½ð±Ò+2): 2011-10-20 20:08:40
xuewenbin(½ð±Ò+70, ·ÒëEPI+1): 2011-10-21 10:57:20
°®ÓëÓêÏÂ(½ð±Ò+2): 2011-10-20 20:08:40
xuewenbin(½ð±Ò+70, ·ÒëEPI+1): 2011-10-21 10:57:20
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