Abstract
We report the one-step syntheses in good yields of the complexes cis-[M(CO)4(pzpy)] {M = Mo, W; pzpy = ethyl[3-(2-pyridyl)-1-pyrazolyl]acetate} directlyfrom the corresponding M(CO)6 starting materials by using microwave-assisted heatingand reaction times of either 30 s (M = Mo) or 15 min (M = W). The structure of themolybdenum tetracarbonyl complex was determined by single crystal X-ray diffraction.The compound is monomeric and the molybdenum atom has a highly distorted octahedralgeometry. The close packing of the individual cis-[Mo(CO)4(pzpy)] species is essentiallydriven by the need to fill the space effectively, closely mediated by weak C–H···O andπ···π interactions.
Highlights
Transition metal carbonyl compounds continue to be investigated for applications in various fields, catalysis [1,2,3,4], non-linear optics [5,6,7] and medicine [8,9,10]
The two N-donor atoms and the two carbonyl groups which make up the equatorial pseudo-plane of the {MoC4N2} octahedron are not all located on the same geometrical plane
In the crystal structure of 1, adjacent cis[Mo(CO)4(pzpy)] complexes close pack with their substituent groups facing each other and interconnected via two weak C–H···O hydrogen bonding interactions: While the –CH2–C(O)O group interacts with the coordinated carbonyl from a neighbouring complex, the N(3)-adjacent C–H moiety of the pyrazole ring donates its hydrogen to form a contact with the acetate group from the same neighbouring Mo complex (Table 2), leading to a hydrogen bonding motif best described by the R22(13) graph set (Figure 2a) [50]
Summary
Transition metal carbonyl compounds continue to be investigated for applications in various fields, catalysis [1,2,3,4], non-linear optics [5,6,7] and medicine [8,9,10]. To the best of our knowledge, no crystal structures have been reported for group 6 tetracarbonyl complexes containing the ethyl[3-(2-pyridyl)-1-pyrazolyl]acetate ligand.
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