TY - JOUR
T1 - Tetrazole and triazole carbene complexes of group 6 metal carbonyls
AU - Frey, Guido D.
AU - Öfele, Karl
AU - Krist, Herbert G.
AU - Herdtweck, Eberhardt
AU - Herrmann, Wolfgang A.
PY - 2006/6/1
Y1 - 2006/6/1
N2 - In order to study the relative stability of cis- and trans-isomers of bis(NHC)tetracarbonyl complexes of group 6 metals, we synthesized the corresponding complexes with triazolin- and tetrazolinylidene ligands. By reaction of the free carbene (L = 1,3,4-triphenyl-4,5-dihydro-1H-1,2,4-triazolin-5-ylidene) - first synthesized by Enders - with the hexacarbonyls of Cr, Mo and W the corresponding M(L)(CO)5 complexes are generated. Depending on an excess of carbene also the cis-(L)2Mo(CO)4 complex was obtained. The latter can be photolytically converted to the trans-(L)2Mo(CO)4 complex. The corresponding complexes with the 1,4-dimethyltetrazolin-5-ylidene ligand (L′), Cr(L′)(CO)5, cis-(L′)2Cr(CO)4 and trans-(L′)2Cr(CO)4 can be obtained by reaction of hexacarbonyl-μ-trihydroxy-dichromate with dimethyltetrazolium salt. In the cis-(L′)2Cr(CO)4 complex, one carbonyl ligand can be replaced by donor ligands such as pyridine or phenylisocyanide to form sym-mer-tricarbonyl complexes. All new complexes are fully characterized by spectroscopy and most by single-crystal X-ray analysis.
AB - In order to study the relative stability of cis- and trans-isomers of bis(NHC)tetracarbonyl complexes of group 6 metals, we synthesized the corresponding complexes with triazolin- and tetrazolinylidene ligands. By reaction of the free carbene (L = 1,3,4-triphenyl-4,5-dihydro-1H-1,2,4-triazolin-5-ylidene) - first synthesized by Enders - with the hexacarbonyls of Cr, Mo and W the corresponding M(L)(CO)5 complexes are generated. Depending on an excess of carbene also the cis-(L)2Mo(CO)4 complex was obtained. The latter can be photolytically converted to the trans-(L)2Mo(CO)4 complex. The corresponding complexes with the 1,4-dimethyltetrazolin-5-ylidene ligand (L′), Cr(L′)(CO)5, cis-(L′)2Cr(CO)4 and trans-(L′)2Cr(CO)4 can be obtained by reaction of hexacarbonyl-μ-trihydroxy-dichromate with dimethyltetrazolium salt. In the cis-(L′)2Cr(CO)4 complex, one carbonyl ligand can be replaced by donor ligands such as pyridine or phenylisocyanide to form sym-mer-tricarbonyl complexes. All new complexes are fully characterized by spectroscopy and most by single-crystal X-ray analysis.
KW - 1,2,3,4-Tetrazolin-5-ylidene
KW - 1,2,4-Triazolin-5-ylidene
KW - Carbene complexes
KW - Group 6 carbonylcomplexes
KW - N-heterocyclic carbenes
UR - https://www.scopus.com/pages/publications/33646518342
U2 - 10.1016/j.ica.2005.09.049
DO - 10.1016/j.ica.2005.09.049
M3 - Article
AN - SCOPUS:33646518342
SN - 0020-1693
VL - 359
SP - 2622
EP - 2634
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 9
ER -