By Bryan L. Connelly
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Extra info for Chemical Crystallography (Chemistry Research and Applications)
Lesley Lewis-Alleyne, Don vanDerveer et al. 55 The formula unit contains three water molecules, one of which is disordered in the crystal structure (O(40)). The other two water molecules form hydrogen bonds with the dianionic dipic ligand. Additional hydrogen bonding between water molecules O(20) and O(40) was found. 95(5) Å). Hydrogen bonds are formed between a H-donor and a H-acceptor, and those hydrogen bonds in which the proton originates in [CoII(H2dipic)(dipic)] are shorter than those in which [CoII(H2dipic)(dipic)] is the H-acceptor.
2H2O. 3H2O is shown in Figure 25. Two nitrogen and four oxygen atoms are coordinated to the cobalt atom resulting in a distorted octahedron. Each of the two tridentate dipic2- ligands coordinates through two oxygen atoms and one nitrogen atom. One of the dipic groups is coordinated as dipic2- and the other as H2dipic, resulting in this complex containing four of the different coordination modes (a-d) illustrated in Figure 3 above. 021(3) Å). 56 The longest bond is observed in a type c coordination mode (Co-O(2)), and the shortest bond is observed in a type a coordination mode (Co-O(12)).
Table 8. Selected bond lengths (Å) and angles (°) for [MoO2(dipic)(DMF)], [MoO2(dipic)(DMSO)], and [MoO2(dipic)( OPPh3)]. 35(9) (iii) Figure 33. Diagrams of [MoO2(dipic)(DMF)] (i), [MoO2(dipic)(DMSO)] (ii), and [MoO2(dipic)( OPPh3)] (iii). (Reproduced by permission from reference 156) Dipicolinic Acid, Its Analogues, and Derivatives: Aspects of Their… 47 Figure 34. A diagram of [Ru(dipic)(PPh3)2Cl]. (Reproduced by permission from reference 157). 157 The ligand behaves as tridentate dibasic chelate.