Structure and properties of iron–cyclam complex of 2-aminophenol

Capturing the Heptaniobate {Nb7O22}9– Anion by Covalent Bond Formation: Synthesis, Crystal Structure, and Selected Properties of {[Fe(cyclam)]3Nb7O22}· ≈ 19 H2O

“…The N–Fe–N cis ‐angles are between 80.5(5) and 91.1(6)°, the N–Fe–O cis ‐angles range from 86.4(5) to 97.8(6)°, and the N–Fe–N trans ‐angle is 161.3(7)° (Table S3). These values are in good agreement with literature data …”

“…The Fe–O bond length are between 1.873(6) and 1.945(6) Å and the Fe–N bonds are at 2.13(3)–2.224(14) Å. These data are in good agreement with that in complexes containing Fe 3+ in the high spin state . The N–Fe–N cis ‐angles are between 80.5(5) and 91.1(6)°, the N–Fe–O cis ‐angles range from 86.4(5) to 97.8(6)°, and the N–Fe–N trans ‐angle is 161.3(7)° (Table S3).…”

“…In most cases, the cyclam ligand is coordinated in planar mode but here one of the CH 2 –CH 2 –CH 2 –N–CH 2 –CH 2 fragments is rotated by about 90° (Figure ) . This kind of coordination was already reported for this ligand in some Fe centered complexes . The Fe–O bond length are between 1.873(6) and 1.945(6) Å and the Fe–N bonds are at 2.13(3)–2.224(14) Å.…”

Dicarbonylrhodium(I) complexes of aminophenols and their catalytic carbonylation reaction

“…It is observed that the order of appearance of ν(CO) bands in respect of energy is 1a > 1c > 1b, which could not be explained from the electron donating ability, as indicated above. The proper interpretation is likely to be associated with other factors like phenoxide formation, field effect and mutual coupling, 23,24,34,36 which need be considered for total and perfect analysis of the observed ν(CO) values.…”

“…A number of such N-donor ligands have been explored and designed 17 -22 to minimize the hardness of the donor site. There are some preliminary reports of rhodium and iron complexes of aminophenol ligands, 23,24 but a systematic study of reactivity of these complexes towards various electrophiles, catalytic applications and the theoretical aspects has not been carried out so far. In view of the above, a series of rhodium carbonyl complexes of 2-, 3-and 4-aminophenol ligands have been synthesized to study the effect of -OH groups at different positions of benzene ring on the electron-donating capacity of the N-donor site and to evaluate the catalytic activities of the complexes towards carbonylation of methanol.…”