Photochemistry of (η-benzene)tricarbonylchromium, tricarbonyl-(η-cyclopentadienyl)manganese, and (η-cyclobutadiene)- and (tris-methylenemethane)-tricarbonyliron in frozen gas matrices at 12 K. Infrared spectroscopic evidence for dicarbonylmetal and dicarbonyl-(dinitrogen)metai complexes

Abstract

C4H4) (CO) 31 and [Fe(C(CHJ 3HCO) 31 * [711472

A laser flash photolysis, matrix isolation, and DFT investigation of (η6-C6H5Y)Cr(CO)3 (Y=NH2, OCH3, H, CHO, or CO2CH3)

“…4). Further reduction of the excitation wavelength to 334 nm resulted in a significant increase in the formation of (g 6 -C 6 H 6 )Cr(CO) 2 as observed by Rest et al who used broad-band irradiation techniques but the weak feature at 2060 cm À1 is depleted under these conditions [21].…”

“…Low temperature photochemistry of (g 6 -C 6 H 6 )Cr(CO) 3 in a CH 4 matrix at 12 K Despite the previously published work on the photochemistry of (g 6 -C 6 H 6 )Cr(CO) 3 in low temperature matrixes [21], it was decided to revisit this system and to apply the same experimental methodology as applied to the substituted system described later.…”

Organometallic photochemistry at the end of its first century

“…The close relationship between time resolved methods and matrix studies is nicely illustrated in the early literature by flash photochemical studies (uv/visible detection) of (C 6 H 6 )Cr(CO) 3 that revealed the presence of a short lived photointermediate [19]. Subsequent studies by Rest established the existence of the CO-loss photoproducts for this compound as well as for CpMn(CO) 3 and (C 4 H 4 )Fe(CO) 3 using inert gas matrices [20]. Braterman and Black had previously observed the CpMn(CO) 3 photoproduct in hydrocarbon glasses [21].…”

Formation and reactivity of organometallic alkane complexes

“…This shift in the UV/visible band of Cr(CO) 5 could not be accounted for by matrix environment effects and was interpreted to indicate a significant interaction between the matrix material and the Cr(CO) 5 fragment. Matrix isolation studies have continued to be useful in characterising very unstable reactive fragments in recent years [16], with the interaction of CH 4 with both organometallic complex fragments [17][18][19] and with isolated metal atoms being examined [20].…”