Synthesis and reactivity of an osmium(iii) aminoguanidine complex

Abstract

An osmium(iii) aminoguanidine complex (OsGNH2) has been synthesized, which possesses rich redox chemistry.

Sinapic Acid Co-Amorphous Systems with Amino Acids for Improved Solubility and Antioxidant Activity

“…Due to their structure, amino acids can exhibit antioxidant properties, whose underlying mechanisms vary due to structural differences in their side chains [ 52 ]. In addition, those properties can be changed upon bonding to metal ions [ 53 , 54 , 55 ]. According to the literature [ 56 ], LYS exhibits ferrous ion-chelating activity and DPPH radical- and hydroxyl radical-scavenging activity, among others.…”

Visible light-induced oxidative N-dealkylation of alkylamines by a luminescent osmium(vi) nitrido complex

“…The C17–N6 (1.276(6) Å) and C17–N7 (1.338(6) Å) bond distances, and the N6–C17–N7 bond angle (127.8(5) o ) are similar to those of reported amidine complexes. 9 In 3 , the Os–N5 and N5–C17 bond lengths of 2.017(4) and 1.135(7) Å, respectively, and the close to linear Os1–N5–C17 bond angle of 172.0(4)° are consistent with a neutral CH 3 CN ligand. Complex 4 features an anionic iminato ligand; the Os–N5 bond length is 1.849(9) Å, indicating a double bond character.…”

Chalcogen atom abstraction from NCE− (E = O, S, Se) and i-Pr2S by the excited state of a luminescent tricyano osmium(vi) nitride

“…17–19 However, to the best of our knowledge, S/Se atom transfer from NCE − anions, which involves cleavage of strong CE bonds, has not been reported. The photoreaction of OsN with (PPh 4 )NCO has also been investigated; however, its reaction rate is much slower, and the yield of (PPh 4 )[Os(NO)(L)(CN) 3 ] ( OsNO ) 20,21 is only ∼10%, which is probably due to the stronger CO bond than CS and CSe bonds in NCE − . O atom transfer to metal nitride usually occurs with oxidants such as Me 3 NO.…”

“…The OsNO also could be obtained from oxidation of the guanidine precursor ( OsG ) by excess m -chloroperbenzoic acid ( m -cpba) in CH 3 CN with about 60% yield. 20,21 Selected IR (KBr disc, cm −1 ): v (CN) 2150 and 2139; v (NO) 1849; ESI/MS (−ve mode): m / z 555 ([M] − ); UV/vis (CH 3 CN): λ max [nm] ( ε [mol −1 dm 3 cm −1 ]): 270 (14 210), 277 (15 950), 295 (18 980), 357 (17 660), 435sh (760). 1 H NMR (400 MHz, CDCl 3 ): δ 8.92 (s, 1H, Ar–H), 8.03 (d, J = 9.5 Hz, 1H, Ar–H), 7.92 (t, J = 7.4 Hz, 4H, PPh 4 –H), 7.80 (d, J = 7.8 Hz, 8H, PPh 4 –H), 7.73 (t, J = 7.4 Hz, 2H, Ar–H), 7.65 (dd, J = 12.8, 7.9 Hz, 8H, PPh 4 –H), 7.58–7.50 (m, 2H, Ar–H), 6.70 (d, J = 9.3 Hz, 1H, Ar–H).…”