Vanadium and titanium have been codeposited with molecular hydrogen in Kr and Ar matrices at 12 K. Both metals show photoreactivity toward molecular hydrogen and undergo insertion into the H-H bond to form metal dihydrides, MH2 (M = Ti, V). The symmetric and antisymmetric stretching frequencies have been detected for both VH2 and TiH2. The bond angles for TiH2 and VH2 were estimated to be 145 +/- 5-degrees and 127 +/- 5-degrees, respectively. The stretching force constants for TiH2 and VH2 were calculated to be 1.29 and 1.44 mdyn/angstrom, respectively. Vanadium monohydride was also identified as a photolysis product. Vibrational band assignments have also been made for TiH4. Small titanium clusters, Ti(n) were isolated and shown to react spontaneously with H-2.