Nine-coordinate compounds

Only two stereochemistries need be considered for nine-coordinate compounds ... 

The reaction products of 2,2 -bipyrimidine (bpm), P-diketones, and lanthanide ions demonstrated the diverse nuclearity and dimensionality. As stated in the last section, dinuclear eight-coordinate [Ln2(P-diketonate)6(bpm)] could be formed [78, 79]. Zucchi et al. [26a] reacted Nd(N03)3 with bpm to afford the mononuclear nine-coordinate adduct [Nd(N03)3(bpm)(Me0H)2], while reactions of hydrated NdCb and various P-diketonates in the presence of bpm gave the binuclear nine-coordinate compounds [ Nd(L )3(THF) 2([JL-bpm)] (see Figure 2.46) and [ Nd(L )3(MeOH) 2([r-bpm)]-bpm (see Figure 2.47) and the one-dimensional coordination polymer [Nd(L )3(p,-bpm)-MeOH]oo (4-MeOH) (see Figures 2.48 and 2.49). Other groups have also reported the one-dimensional arrays [Ln(L )3(p.-bpm)]co (Ln = Eu [80], Gd, and Nd [75]. 

The pyrophosphate of uranium(IV) has been obtained and the structure determined to belong to the ZrP207-type structure. " Octahedral sites in the zirconium phosphates can accommodate U, as exemplified by the Na dizirconium tris(phosphate) structural family ([NZP]). An end member in this study was monoclinic KU2Zr(P04)3, which contains nine-coordinate Compounds of the general formula MU2(P04)3 have been reported for... 

The minimum structure of the nine-coordinated compound [Rh(ZnH)g] (67H) has Dsh symmetry (Fig. 14). The Zn-Zn distances of the closest neighbouring zinc atoms (2.853A and 3.044A) are longer than those in 61H and 65H. The resulting... 

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