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By Bancroft W. D.

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Hydrogen atoms are omitted for clarity. Code for atoms as in Fig. 37 as citric acid [173]. Among the compounds with Ni(II) is 66 [174], one of the largest Ni clusters known [175]. The structure (Fig. 39) contains a planar central unit [Ni7 (µ3 – OH)6 ], similar to that seen in a layer of Ni(OH)2 , and comparable with that found in [Fe19 ] [138] or [Co24 ] [176] clusters. Twelve bridging citrate ligands in five different binding modes link the remaining metal centres to this unit. Cluster 66 displays two chiral centres on Ni(II) atoms at both ends of the molecule.

K. Brechin Fig. 35 PovRay representation of the anion of (NEt4 )[Fe11O4 (O2 CPh)10 (thme)4 (dmhp)2 Cl4 ] (59). Hydrogen atoms are omitted for clarity. Code for atoms as in Fig. 8 [Fe9 O4 (OH)5 (heia)6 (Hheia)2 ] (60); A Piece of All-Ferric Molecular Magnetite The cluster [Fe9 O4 (OH)5 (heia)6 (Hheia)2 ] (60, Fig. 36) [160] was prepared in methanol from Fe(NO3 )3 · 9H2 O and H2 heia in the presence of tetramethyammonium hydroxide. The structure features a central tetrahedral Fe(III) ion bound by four µ3 – O2– groups to eight peripheral octahedral ferric centres.

This molecule (Fig. 33) comprises two groups of four Fe(II) centres, linked via a central Fe(II) by four pdol2– ligands. Within each group, the Fe(II) atoms are bridged by a rare µ4 – N3 – ion and four µ2 – OAc– ligands. This complex was prepared from the structurally related cluster [Fe9 (OH)2 (O2 CMe)8 (pdol)4 ] Fig. 33 PovRay representation of [Fe9 (N3 )2 (O2 CMe)8 (pdol)4 ] (56). Hydrogen atoms are omitted for clarity. Code for atoms as in Fig. 29 42 G. K. Brechin (57) via the selective replacement of two µ4 – OH– ligands by µ4 – N3 – groups.

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