THE FORMATION AND THERMAL-DECOMPOSITION OF SOME ALKYL-MANGANESECARBONYL AND ACETYL-MANGANESECARBONYL COMPLEXES WITH DIALKYLTELLURIUM LIGANDS

Treatment of MeMn(CO)(5) with the dialkyltellurium compounds TeR(2) (R = Me, Et, Pr-i) gave the acyl complexes MeCOMn(CO)(4)(TeR(2)) in high yield. A similar reaction between EtCOMn(CO)(5) and TeR(2) (R = Me, E t) yielded the related complexes EtCOMn(CO)(4)(TeR(2)). When the benzy l complex BzMn(CO)(5) was treated with TeR(2) (R = Me, Et), BzCOMn(CO) (4)(TeR(2)) was formed initially but, on prolonged reaction in a reflu xing solvent, decarbonylation occurred to form BzMn(CO)(4)(TeR(2)). Re lated bromo complexes BrMn(CO)(4)(TeR(2)) were obtained when BrMn(CO)( 5) was treated with TeR(2) (R = Me, Et). Spectroscopic results indicat ed that all of the TeR(2) substitution products have octahedral stereo chemistry about manganese with a cis-configuration of the tellurium li gand and the organo or halo group. Some of the complexes were selected for assessment as possible MOCVD single source precursors. Although m ost of the compounds are liquids with significant volatility, they ten d to dissociate when heated with release of the dialkyl-tellurium. Non etheless, pyrolysis of the compounds R'COMn(CO)(4)(TeR(2)) (with R' = Me and R = Me, Et or Pr-i; R' = Et and R = Et) under typical MOCVD con ditions (H-2 stream, 175-225 degrees C) produced metal films containin g manganese and tellurium