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Transition Metal Hydrides

Transition metal is covalently bonded to hydrogen in transition metal hydrides which generally have a formulation of the type MHxLy where M = transition metal and L = carbon monoxide CO, organophosphine R3 P, cyclopentadieno C5H5-. etc., type of ligands which can act both as o-donor as well as π- acceptor ligands* M   : L Besides being covalent , the transition metal-hydrogen bond is longer than normal. Some examples of these hydrides are :

K3 [ H-Co(CN)5 ], (C5H5)2MoH2, (C5H5)2Re-H, (Et3 P)2(CI)Pt-H, HMn(CO)5

Preparation of Transition metal hydrides

Transition metal hydrides are not many in number. Some of the important ones are prepared as follows:

(i)     MOCI5 + 3NaC5H5** + 2NaBH4   →   (C5H5)2MoH2 + 5NaCI + B2H6 + 1  C10H10
(ii)   (C5H5)Fe(CO)2CI + NaBH4    →     (C5H5)Fe(CO2)H + NaCI + BH3
(iii)          Pt(PR3)2 CI2 + LiAIH      →     (PR3)2Pt(CI)H + LiCI + AIH3

Prosperities of Transition metal hydrides

Most of these compounds are very reactive solids. For example, (C5H5)2 MoH2 reacts with chloroform t form dichloro derivative.
(C5H5)2 MoH2    →     (C5H5)2MoCI2 .
(R3P)2Pt(CI)H reacts with ethylene to form ethyl derivative.
(R3P)2(CI)Pt-H + C2H4   →    (R3P)2 (CI)Pt-C2H5

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