Complexes of palladium, platinum and rhodium with potentially tetradentate ligands containing nitrogen and tellurium donor atoms (N2Te2)

Reactions of Schiff Base‐Substituted Diselenides and ‐tellurides with Ni(II), Pd(II) and Pt(II) Phosphine Complexes

“…Until today, tri-and tetradentate Schiff bases are common ligands for nickel, palladium and platinum, as they yield stable, flexible and easily tunable complexes due to the modularity of the Schiff base preparation. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Hundreds of such compounds have been characterized crystallographically. [16] The introduction of additional chalcogen donor atoms in the form of arylchalcogenolato units is a common motif to modulate the properties of the resulting complexes.…”

“…1H, m, L ArH13), 6.45 (1H, m, L ArH3), 6.10 (1H, d,3 J H5,H4 = 8.58 Hz, L ArH5) 13. C NMR (CDCl 3 , ppm): 164.8 (s, L C Ar 6), 159.9 (s, HC17R=NR), 158.6 (s, L C Ar 11), 135.3 (s, L C Ar 2), 134.8 (s, L C Ar 4), 134.7 (d, 3 J C,P = 6 Hz, m-P-C Ar ), 134.7 (overlapped s (in the middle of the d for m-P-C Ar ), L C Ar 16), 132.2 (d, 4 J C,P = 10 Hz, L Ar 16), 130.6 (s, p-P-C Ar ), 130.6 (d, 1 J C,P = 48 Hz, P-C Ar ), 128.2 (d, 2 J C,P = 10 Hz, o-P-C Ar ), 126.6 (s, L C Ar 13), 125.2 (s, L C Ar 14), 121.9 (s, L , 120.1 (s, L C Ar 12), 118.1 (s, L C Ar 15), 115.3 (s, L C Ar 3), 112.4 (d, 3 J C,P = 11 Hz, L C Ar 1-Te).…”

Halogenation of Diorganotelluride [2,6‐(Me2NCH2)2C6H3]TenBu: Synthesis, Molecular and Electronic Structural Investigation of Monoorgano Dihalotelluronium(IV) Cation

“…From literature studies it is perceived that IChB stabilized diorganotellurides on treatment with various reagents, undergo labilisation of Te–C bond trans to the IChB interactions leading to the isolation of various cleaved product(s). [ 3o,12 ] In line with this fact, as mentioned in the introduction section, we have recently observed that reactions of homoleptic diorganotelluride 2 with HgCl 2 and SO 2 Cl 2 :K 2 PdCl 4 :KOH resulted into the cleavage of trans Te–C bond affording a tellurenium(II) cation [2,6‐(Me 2 NCH 2 ) 2 C 6 H 3 Te] · HgCl 4 and Pd complex of a tellurenium(II) cation [2,6‐(Me 2 NCH 2 ) 2 C 6 H 3 ]TePdCl 3 , respectively. [ 8 ] To explore the effect of trans lablisation in the case of heteroleptic diorganotelluride, we have treated diorganotelluride 1 with HgCl 2 (Scheme 3).…”

“…[ 3m ] Recently, we have reported the molecular structures of IChB stabilized diorganoditelluroxonium(IV) cation, namely [ppyTe(µ‐O)] 2 · 2ClO 4 and [2,6‐(Me 2 NCH 2 ) 2 C 6 H 3 Te(µ‐O)] 2 + · [PdCl 3 (DMSO)] – 2 . [ 3o,12h ]…”

“…A similar observation was also made in the recently reported diorganoditelluroxonium(IV) cation, namely [2,6‐(Me 2 NCH 2 ) 2 C 6 H 3 Te(µ‐O)] 2 + · [PdCl 3 (DMSO)] – 2 , wherein due to the extensive cation ··· anion interactions, a cis orientation of the pincer ligands were observed. [ 12h ] In contrast, in the case of [2,6‐(Me 2 NCH 2 ) 2 C 6 H 3 Te(µ‐O)] 2 + · PF 6 – , no such cation ··· anion interactions are present and hence, the more sterically favorable trans conformation has been adopted. [ 13 ] In the other two related structures containing the Te 2 O 2 2+ core, the same cis configuration has been adopted to allow the formation of interionic Te ··· O interactions.…”