Pyridine‐ and 3‐/6‐Methylpyridine‐2‐tellurolate Complexes of Palladium(II) and Platinum(II)

Abstract

The reaction of py2Te2 or (3‐MeC5H3N)2Te2 with Na2PdCl4 in methanol yields an insoluble brown complex, [PdCl(TeNC5H3R)]n (R = H or Me). Several reactions of pyTe−, (3‐MeC5H3N)Te−, or (6‐MeC5H3N)Te− with various palladium(II) and platinum(II) complexes have been carried out. Complexes of the types [MCl(Te−N)(PR3)], [Pt(Te−N)2(dppe)], [Pt(Te−N)2(PPh3)2], and [Pt2(μ‐Te−N)2(dppe)2][BPh4]2 [M = Pd or Pt; Te−N = pyTe, (3‐ or 6‐MeC5H3N)Te] have been prepared and characterized by elemental analyses, UV/Vis, IR, and NMR (1H, 31P, 195Pt) spectroscopy. The complexes [MCl(Te−N)(PR3)] show irreversible oxidation and reduction by CV in DMF. The molecular structure of [PdCl{Te(3‐MeC5H3N)}(PPh3)] (2c) has been established by single‐crystal X‐ray diffraction analysis. The palladium atom is bound to the chelating 3‐methylpyridinetellurolate ligand, a chlorine atom and a PPh3 ligand. The pyrolysis of [PdCl{Te(3‐MeC5H3N)}(PR3)] (PR3 = PEt3 or PPh3) at 340 °C yields PdTe. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)

Palladium(II) and platinum(II) 2-(methoxycarbonyl)ethylselenolates: Synthesis, spectroscopy, structures and their conversion into metal selenide

“…Recently we have employed internally functionalized hemi-labile ligands like pyridine-2-chalcogenolates [5,6] and dimethylaminoalkyl chalcogenolates, Me 2 N(CH 2 ) n E À [7][8][9][10][11][12]. These ligands have not only shown versatile coordination chemistry but their complexes have also served as precursors for the synthesis of metal chalcogenides [5][6][7] as well as for the study of metal mediated donor-acceptor interactions [8,9]. The continued interest in selenium/tellurium containing inorganic materials [13][14][15] and in pursuance of our work on design and development of precursors for chalcogenide materials, we have now synthesized (MeOOCCH 2 CH 2 Se) 2 and explored the chemistry of its palladium and platinum complexes.…”

“…Several strategies have been developed to suppress polymerization, the use of hybrid ligands has been quite successful. Recently we have employed internally functionalized hemi-labile ligands like pyridine-2-chalcogenolates [5,6] and dimethylaminoalkyl chalcogenolates, Me 2 N(CH 2 ) n E À [7][8][9][10][11][12]. These ligands have not only shown versatile coordination chemistry but their complexes have also served as precursors for the synthesis of metal chalcogenides [5][6][7] as well as for the study of metal mediated donor-acceptor interactions [8,9].…”

Trifluoromethylselenato(0) and trifluoromethyltellurato(0) complexes of platinum(II)

“…A complete set of the NMR data for all derivatives synthesized or detected is provided in Table 1 indicating good agreement with data reported for the sulphur derivatives [8,[15][16][17] and related PtSeR, e.g., [9,10,[18][19][20] and PtTeR compounds e.g. [19][20][21] as well as, with respect to the ECF 3 group, group 11 metallates [6,7]. In solution the existence of only one cis-and one trans-isomer is anticipated, while in the solid state ½PtðERÞ 2 ðPR 0 3 Þ 2 complexes could give rise to four possible isomers, cis/anti, cis/syn, trans/anti and trans/syn [9] (Scheme 1).…”

Synthesis and characterization of chalcogen (S and Se) derivatives of 4-chloro- and 4-methoxy-N,N-diisopropylpyridine-2-carboxamide: X-ray structure of 4-methoxy-3-(sulfanylmethyl)- and 4-chloro-3-(selenenylbenzyl)-N,N-diisopropylpyridine-2-carboxamide

“…The bond angles and bond length of the pyridine ring is comparable to that in dipyridyl diselenide [24]. (8) 1.512(6) C(4)eC (7) 1.519(6) S(1)eC(5) 1.787(5) C(7)eN(2)eC (12) 122.3(4) C(12)eN(2)eC(9) 116.8 (17) 116.8(4) C(8)eSe(1)eC (7) 98.01(18) …”

“…Internally stabilized organoseleniums have shown much better antioxidant properties, as they form stable intermediates during the process involving the removal of oxidants [11]. The metal chalcogenolates containing these moieties also serve as excellent single source precursors of the semiconducting materials [12,13]. In addition to these, the organoselenium compounds containing the pyridyl moieties serves as an efficient reagents in the selenoxide elimination reactions for the synthesis of terminal olefins [14].…”