Abstract
The quadruply bonded compound Mo2(DpyF)4 (1), where DpyF- is the anion of N,N′-di(2-pyridyl)formamidine, has been prepared by ligand substitution reactions of Mo2(OOCCF3)4 and either the neutral ligand, HDpyF, at ambient temperature or its lithium salt, LiDpyF, under refluxing conditions. An X-ray structural analysis shows that 1 has a paddlewheel structure with a Mo4-Mo distance of 2.1108(6) Å. Reaction of 1 with CoCl2 in methanol produces the paramagnetic compound [Mo2Co(DpyF)4][CoCl4]·2MeOH (2). The Co(II) atom in the cation [Mo2Co(DpyF)4]2+ resides on a low-spin hexacoordinate environment (S = 1/2) with a Co···Mo separation of 2.979(6) Å, suggesting there is no direct bonding interaction between the Co and Mo atoms. The Mo-Mo distance of 2.1096(5) Å is similar to that in 1. Reaction of 1 and CuCl in methanol yields [Mo2Cu4(DpyF)4Cl2] [CuCl2]2· 2MeOH·Et2O (3). In the cation there are two copper atoms on each side of the Mo2 core. Each is coordinated to two pyridyl nitrogen atoms of the cis DpyF- ligands and loosely bridged to the other by a chloride ion. As a result, the Cu(I) atoms are not aligned with the Mo2 unit. The Cu to Mo separations are in the range 3.003(1)-3.015(1) Å, and the Mo-Mo distance of 2.127(1) Å is comparable to those in 1 and 2.
Original language | English |
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Pages (from-to) | 420-426 |
Number of pages | 7 |
Journal | Inorganic Chemistry |
Volume | 40 |
Issue number | 3 |
DOIs | |
State | Published - Jan 29 2001 |
Externally published | Yes |