Ambident nitrogen and oxygen ligands of the type tris(pyrazolyl)methanesulfonate: An “IR criterion” for the assignment of the coordination mode

Synthesis and Structural Features of New Ruthenium(II) Complexes Containing the Scorpionate Ligands Tris(pyrazol‐1‐yl)methanesulfonate (Tpms) and Tris(pyrazol‐1‐yl)methane (Tpm)

“…However, for 1b, the IR spectrum shows more bands in the region 1400-1000 cm -1 than for 1a, and two different bands at 1088 and 860 cm -1 for the C-N bonds can be observed, which indicate κ 3 (N,N,O) coordination for Tpms. [10] In both complexes, the band due to the C-S stretching vibration appears at 621 cm -1 . The rest of the data are in accordance with the proposed structures: (i) a singlet resonance is observed at 38.9 (1a) and 35.8 (1b) ppm in the 31 P{ 1 H} NMR spectra indicating the equivalence of the two phosphorus atoms for both complexes.…”

Water‐Soluble C‐Scorpionate Complexes – Catalytic and Biological Applications

“…The sulfonate group of a Tpms R [e.g., R = H (Tpms) or Ph (Tpms Ph )] ligand can be involved in the coordination to the metal center, and this converts the corresponding N 3 ‐type Tpm R ligand into a more versatile one that can coordinate as a tripodal or bipodal ligand with N 3 ‐, N 2 O‐, N 2 ‐, or NO‐coordination modes (see Figure ) , …”

“…The vanadium(IV) complex 6 also operates under aerobic and solvent‐free conditions. Cyclohexane is oxidized to cyclohexanol (the main product) and cyclohexanone (13 % conversion) with a high selectivity, typically at an O 2 pressure of 15 atm at 140 °C for18 h …”

s‐Block Metal Complexes with Bis‐ and Tris(pyrazolyl)methane and ‐methanide Ligands

“…Kläui and co‐workers investigated the dimer [(Pz t Bu 3 C‐SO 3 )Li] 2 with a κ 2 N ,κ O ‐binding ligand with a bridging sulfonato moiety . In this complex two pyrazolyl bases are ligated at lithium and one pyrazolyl ring is free.…”