By J. A. McCleverty, T.J. Meyer
Complete Coordination Chemistry II (CCC II) is the sequel to what has turn into a vintage within the box, finished Coordination Chemistry, released in 1987. CCC II builds at the first and surveys new advancements authoritatively in over two hundred newly comissioned chapters, with an emphasis on present tendencies in biology, fabrics technology and different components of latest clinical curiosity.
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Additional resources for Comprehensive Coordination Chemistry II. Transition Metal Groups 7 and 7
39 Manganese –OOC O O O O O– Mn O– O O– O O COO– (94) (i) Dinuclear complexes Dinuclear manganese(III) complexes with carboxylates fall into two categories: (i) those with one or two alkoxo bridge(s) and (ii) those with an (2-O2À) bridge. Structural, magnetic, and spectroscopic properties of some selected complexes are summarized in Tables 5 and 6. For both types, bridging carboxylates (one or two) are also present (see Figure 20). With the exception of the complex Table 3 Structural information of selected mononuclear manganese(III) complexes.
Based on the variable temperature magnetic measurement, the compound was found to have a ground spin state of 4. All nonanuclear complexes contain two types of bridging acetates: 2-1-acetato and -1,2-acetato but in different ratios. 312 Both have the same [Mn10(3-O)6(4-O)2]14þ core, but differ in the nature of the chelated ligands at two positions. The simulation of the magnetic data at 320–2 K for (121) indicates a ground spin state of 0; however, a ground spin state of 1 or 2 with very low lying excited state cannot be ruled out without data measured below 2 K.
225 The structure consists of an Mn core that is approximately planar and is ligated on the periphery by 16 -O2CCH2But groups 31 Manganese Mn Mn O O Mn O Mn O O O O Mn O O Mn O O O O Mn Mn O Mn Mn O O O O Mn Mn O O O Mn Mn O O Mn Mn Figure 12 Core structure of [Mn16O16(OMe)6(OAc)16(MeOH)3(H2O)3]Á6H2O (76). and 10 H2O molecules. The complex is trapped valence, the MnIII ions lying in the outer ring. The 21 Mn ions are not all in the same plane: the 9 MnIV ions and 2 MnIII ions are coplanar, but the 2 Mn5 crescents at top and bottom are slightly above and below this plane The structure can further be described as being composed of a [Mn21O24(OMe)8] core (Figure 13) as a CdI2-like [Mn9IVO20] sheet held within a nonplanar [Mn12IIIO12] ring.