MONOMERIC 3-COORDINATE AND 4-COORDINATE MAGNESIUM AMIDES

Treatment of trimethylsilyl)amido)bis(tetrahydrofuran)magnesium with 2 equiv of 2,3,5-collidine, 2-picoline, 4-picoline, or 3,5-lutidine in benzene at room temperature for 18 h afforded trimethylsilyl)amido)bis (2,3,5-collidine)magnesium (80%), (bis(trimethylsilyl)amido)bis(2-pico line)magnesium (70%), (bis(trimethylsilyl)amido)bis(4-picoline)magnesi um (48%), or is(trimethylsilyl)amido)bis(3,5-lutidine)magnesium (58%), respectively. Sublimation of trimethylsilyl)amido)bis(2,3,5-collidine )magnesium (90 degrees C, 0.1 mmHg) and (bis(trimethylsilyl)amido)bis( 2-picoline)magnesium (115 degrees C, 0.1 mmHg) afforded colorless crys tals of is(trimethylsilyl)amido)(2,3,5-collidine)magnesium (53%) and b is(bis(trimethylsilyl)amido)(2-picoline)magnesium (46%), respectively. Treatment of trimethylsilyl)amido)bis(tetrahydrofuran)magnesium with 1 equiv of 2,6-lutidine in benzene at room temperature for 18 h afford ed s(bis(trimethylsilyl)amido)(2,6-lutidine)magnesium (56%). The X-ray crystal structures of rimethylsilyl)amido)bis(2,3,5-collidine)magnesi um, bis(trimethylsilyl)amido)bis(4-picoline)magnesium, is(bis(trimethy lsilyl)amido)(2-picoline)magnesium, and s(bis(trimethylsilyl)amido)(2, 6-lutidine)magnesium were determined. trimethylsilyl)amido)bis(2,3,5-c ollidine)magnesium crystallizes in the monoclinic space group C2/c wit h a = 11.8410(7) Angstrom, b = 20.5413(13) Angstrom, c = 15.5746(10) A ngstrom, beta = 93.072(2)degrees, V = 3782.8(4) Angstrom(3): and Z = 4 . (bis(trimethylsilyl)amido)bis(4-picoline)magnesium crystallizes in t he triclinic space group P (1) over bar with a = 10.4914(6) Angstrom, b = 11.8504(6) Angstrom, c = 15.4546(9) Angstrom, alpha = 99.3180(10)d egrees, beta = 98.4180(10)degrees, gamma = 111.5320(10)degrees, V = 17 18.8(2) Angstrom(3), and Z = 2. Bis(bis(trimethylsilyl)amido)(2-picoli ne)magnesium crystallizes in the orthorhombic space group Pbca with a = 18.4536(14) Angstrom, b = 15.2326(9) Angstrom, c = 20.614(2) Angstro m, V = 5794.6(7) Angstrom(3), and Z = 8. s(bis(trimethylsilyl)amido)(2 ,6-lutidine)magnesium crystallizes in the orthorombic space group Pbca with a = 18.6221(13) Angstrom, b = 15.3236(9) Angstrom, c = 20.9085(1 4) Angstrom, V = 5966.4(7) Angstrom(3), and Z = 8. Application of the these complexes as source compounds in chemical Vapor deposition proce sses is discussed.