STRUCTURAL STUDIES OF SOME GROUP-12 METAL ALKYL ADDUCTS - THE X-RAY CRYSTAL-STRUCTURES OF ME2ZN[ME2N(CH2)2NME2], ME2CD[ME2N(CH2)2NME2], (ME3CCH2)2ZN[ME2N(CH2)2NME2] AND (ME3CCH2)2CD[ME2N(CH2)2NME2]

The X-ray crystal structures of a series of group 12 metal alkyl adduc ts Me2M[Me2N(CH2)2NMe2] {M = Zn (1), Cd (2)) and (Me3CCH2)2M[Me2N(CH2) 2NMe2] {M = Zn (3), Cd (4)} have been determined. Each adduct exists a s a mononuclear, molecular unit with pseudo-tetrahedral coordination a t the metal centre. Compound 1 crystallizes in space group P2(1)/a, a = 13.868(3), b = 11.616(2) and c = 7.588(2) angstrom, beta = 94.83(2)- degrees, compound 2 in space group Cmca, a = 11.196(2), b = 12.179(2) and c = 17.969(3) angstrom. Compounds 3 and 4 are isostructural in spa ce group C2/c with the following unit cell dimensions for Zn {Cd}: a = 17.167(5) (17.604(5)), b = 9.369(3) {9.484(3)}, and c = 12.916(3) (12 .758(3)) angstrom, beta = 107.83(2) {106.07(2)}-degrees. Compound 1 an d the parent alkyl of 4 have been used successfully in the growth of t hin films by metalloorganic chemical vapour deposition, 1 as a dopant in the growth of p-type GaAs, and [Me3CCH2]2Cd as a Group 12 source in the growth of CdS.