TY - JOUR
T1 - Phosphane Complexes of Alkaline Earth Metals
AU - Karsch, Hans H.
AU - Reisky, Manfred
PY - 1998/7
Y1 - 1998/7
N2 - The reaction of lithium[bis(dimethylphosphanyl)(trimethylsilyl)methanide] Li[(PMe2)2C(SiMe3)] with BeCl2 gave the homoleptic compound Be[(PMe2)2C(SiMe3)]2 (5) with four beryllium-phosphorus bonds constituting a distorted tetrahedron around the beryllium center. The reaction of MgCl2 with Li[(PMe2)2C(SiMe3)] resulted in the formation of the bis-chelate complex Mg[(PMe2)2C(SiMe3)]2 · 2 THF (7), where the distorted cis-octahedral magnesium center is additionally coordinated by two THF ligands. In the reaction of 7 with an additional equivalent of Li[C(PMe2)2(SiMe3)], THF is released and the magnesate anion {Mg[(PMe2)2C-(SiMe3)]3}- (8) was obtained. This compound is not only the first reported hexacoordinated magnesate, but also the first magnesium compound with six magnesium-phosphorus bonds. With CaCl2 and Li[C(PMe2)2(SiMe3)], a heptacoordinated complex Ca[(PMe2)2C(SiMe3)]2 · 3 THF (10) with three coordinating THF ligands was isolated. The complexes were characterized using 9Be{1H}-, 31P{1H}-, 1H-, 13C{1H}-NMR spectroscopy, and elemental analysis and by X-ray diffraction. The neutral compounds are highly soluble in nonpolar solvents.
AB - The reaction of lithium[bis(dimethylphosphanyl)(trimethylsilyl)methanide] Li[(PMe2)2C(SiMe3)] with BeCl2 gave the homoleptic compound Be[(PMe2)2C(SiMe3)]2 (5) with four beryllium-phosphorus bonds constituting a distorted tetrahedron around the beryllium center. The reaction of MgCl2 with Li[(PMe2)2C(SiMe3)] resulted in the formation of the bis-chelate complex Mg[(PMe2)2C(SiMe3)]2 · 2 THF (7), where the distorted cis-octahedral magnesium center is additionally coordinated by two THF ligands. In the reaction of 7 with an additional equivalent of Li[C(PMe2)2(SiMe3)], THF is released and the magnesate anion {Mg[(PMe2)2C-(SiMe3)]3}- (8) was obtained. This compound is not only the first reported hexacoordinated magnesate, but also the first magnesium compound with six magnesium-phosphorus bonds. With CaCl2 and Li[C(PMe2)2(SiMe3)], a heptacoordinated complex Ca[(PMe2)2C(SiMe3)]2 · 3 THF (10) with three coordinating THF ligands was isolated. The complexes were characterized using 9Be{1H}-, 31P{1H}-, 1H-, 13C{1H}-NMR spectroscopy, and elemental analysis and by X-ray diffraction. The neutral compounds are highly soluble in nonpolar solvents.
KW - Alkaline earth metal compounds
KW - Phosphane complexes
KW - Phosphanomethanides
UR - http://www.scopus.com/inward/record.url?scp=2742531164&partnerID=8YFLogxK
U2 - 10.1002/(sici)1099-0682(199807)1998:7<905::aid-ejic905>3.0.co;2-y
DO - 10.1002/(sici)1099-0682(199807)1998:7<905::aid-ejic905>3.0.co;2-y
M3 - Article
AN - SCOPUS:2742531164
SN - 1434-1948
SP - 905
EP - 911
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
IS - 7
ER -