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▫$Synthesis of trans,trans-[MoX_2py_4][MoX_4py_2], trans-[MoX_2py_4]Br_3, and structural identification of trans,trans-[MoX_2py_4][MoX_4py_2] (X=Cl, Br; py=pyridine)$▫
Brenčič, Jurij, 1940-2013 ...
Trans,trans- ▫$[MoX_2py_4][MoX_4py_2] (X=Cl, A;Br, B; py-pyridine, C_5H_5N)$▫ are the side products of reaction of between ▫$(NH_4)_2[MoX_5.H_2O] (X=Cl,Br)$▫ with pyridine diluted with methanol. Both ...trans,trans- ▫$[MoX_2py_4][MoX_4py_2] are monoclinic, P2_1/n$▫ space group, with z=2 and: a=12.568(1), b=9.430(1), c=14.952(1) Å and ▫$\beta=100.81(1)° (A); a=12551(2), b=9.533(2), c=15.366(2) (Å) and \beta=99.35(1) (B)$▫. Cations and anions are located on the symmetry centres and have eclipsed conformation of the trans located pyridine ligands. Average Mo-X and Mo-N (pyridine) bonds are: (cation) 2.41,2.21 Å (A); 2.54, 2.21 Å (B); (anion) 2.44, 2.20 Å (A); 2.58. 2.20 Å (B). Anionic part of the compounds can be oxidised by bromine to ▫$trans-MoX_4py_2$▫, which precipitates from the solution. Cation can be isolated from the solution in the form of ▫$trans[MoX_2py_4]Br_3 (X-Cl, Br)$▫. The compounds were also characterised by chemical analysis, infrared spectroscopy and conductivity measurements.
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