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xuewenbin

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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
»¯ºÏÎï1µÄ½á¾§Îªµ¥Ð±¾§Ïµ£¬¿Õ¼äȺΪP2 1/c (Fig. 1)¡£ËĸöNi(II)ÖÐÐͼ´¦ÓÚŤÇúµÄ°ËÃæÌåµÄÅäλ¹¹ÐÍ£ºNi1ºÍNi2´¦ÓÚË«-Èý±ûÍéÅäÌåµÄ{ N 2 O 4 }»·¾³£¬¶øNi3ºÍNi4ÓÉÅäÌå±ÛµÄËĸöÑõÔ­×ÓºÍ1,3-òüºÏµÄacacÅäÌåµÄÁ½¸öÑõÅäλԭ×ÓËùÁ¬¡£Ã¿¸öË«-Èý±ûÍéÅäÌå¶¼ÊÇÏàͬµÄÁ¬½Óģʽh 3 :h 3 :h 1 :h 1 :h 1 :h 1 :m 4 (Fig. 2)£¬µ«´æÔÚË«»òÈý¸ºÀë×ÓµÄÐÎʽ¡£¡°¶îÍâµÄ¡±ÅäÌåOHµÄÖÊ×Ó´¦Óڶ̵ÄÇâ¼üÖÐO8¨CH8¨CO6 (2.48 A˚ )¡£Å¤ÇúµÄNi 4 Á¢·½ÍéÊǸöµ¥ÑôÀë×Ó£¬Óɾ§¸ñÖеĴ×ËáÒõÀë×Ó½«ÆäµçºÉƽºâ¡£ËäÈ»Ni 4 Á¢·½ÍéÊǸö³£¼ûµÄÍØÆË½á¹¹£¬Ò»¸öÅäÌåÁ´½Óµ½ËùÓÐ4¸öNi(II)ÖÐÐĵÄÁ¢·½ÍéÈ´ÎÅËùδÎÅ¡£11ÔÚ1µÄÇé¿öÖУ¬m 4ÅäÌåµÄÁ´½Óµ¼ÖÂÁ½¸ö²»Í¬µÄ¡°ÉÏ¡±(Ni1, Ni2)ºÍ¡°Ï¡±(Ni3, Ni4)±íÃæ£¬¼Ù¶¨Äܼòµ¥µØÈ¥µôÁ½¸öacacÅäÌ壬Ôò½«À´¿É×÷ΪºÏ³É¸ü´óÅäÌåµÄǰÌå¡£
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