SYNTHESIS AND CHARACTERIZATION OF A SERIES OF TRANS-[(CO)5M(PH2PX(CH2)3N=CHC6H4-OMICRON-O)]2M' (M = MO - X = NH OR M = CR, W - X = CH2 - M' = NI, CU, ZN) COMPLEXES AND THE X-RAY CRYSTAL-STRUCTURE OF TRANS-[(CO)5MO(P(OCH2CME2CH2O)NH(CH2)2-N=CHC6H4-OMICRON-O)]2CU