title: Microwave assisted synthesis of molybdenum and tungsten tetracarbonyl complexes with a pyrazolylpyridine ligand. Crystal structure of cis-[Mo(CO)4{ethyl[3-(2-pyridyl)-1-pyrazolyl]acetate}].
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} directly from the corresponding M(CO)6 starting materials by using microwave-assisted heating and reaction times of either 30 s (M = Mo) or 15 min (M = W). The structure of the molybdenum tetracarbonyl complex was determined by single crystal X-ray diffraction. The compound is monomeric and the molybdenum atom has a highly distorted octahedral geometry. The close packing of the individual cis-[Mo(CO)4(pzpy)] species is essentially driven by the need to fill the space effectively, closely mediated by weak C-H-O and pi-pi interactions.
authors.affiliation: Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal.
authors.forename: Ana C
authors.initials: AC
authors.lastname: Coelho
authors.forename: Filipe A
authors.initials: FA
authors.lastname: Almeida Paz
authors.forename: Jacek
authors.initials: J
authors.lastname: Klinowski
authors.forename: Martyn
authors.initials: M
authors.lastname: Pillinger
authors.forename: Isabel S
authors.initials: IS
authors.lastname: Gonçalves
mesh_terms: D000085:Acetates / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008024:Ligands; D008872:Microwaves; D008958:Models, Molecular; D008982:Molybdenum / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry*; D014414:Tungsten / Q000737:chemistry*
chemical_list: D000085:Acetates; D008024:Ligands; D009942:Organometallic Compounds; D011725:Pyridines; C526254:tetracarbonylacetato(ethyl(3-(2-pyridyl)-1-pyrazolyl))molybdenum(II); D008982:Molybdenum; D014414:Tungsten