Chain Compounds of Molybdenum (II) Trifluoroacetate Linked by p-Quinones [Mo2(O2CCF3)4(p-quin)]n, p-quin = 9,10-anthraquinone, 2,6-dimethyl-1,4-benzoquinone, and 1,4-naphthoquinone

Abstract

A series of chain complexes of molybdenum(II) trifluoroacetate linked by p-quinones, [Mo2(O2CCF3)4(p-quin)]n, p-quin = 9,10-anthraquinone (9,10-aq), 2,6-dimethyl-1,4-benzoquinone (2,6-dmbq), and 1,4-naphthoquinone (1,4-nq) have been prepared. The X-ray structure analyses showed that the carbonyl oxygens of the p-quinones are coordinated to the Mo2 dimers with distances of 2.478(6) and 2.532(5) Å (for 9,10-aq), 2,619(9) and 2.596(10) Å (for 2,6-dmbq), and 2.522(8) Å (for 1,4-nq), respectively. The Mo-Mo bond distances are 2.107(1)- 2.117(1)A, which are slightly longer than that of Mo2(O2CCF3)4 (2.090(4) Å). Elongation of the C=O and C=C bonds of the 9,10-aq and 2,6-dmbq molecules on the coordination has been observed, but the bond distances of the coordinated and uncoordinated 1,4-nq molecules are similar to each other. The difference is discussed in terms of the oxidizing abilities and the symmetries of the p-quinones.