Metal-phosphine chalcogenide interactions. Crystal structures of palladium(II)/mercury(II) complexes with 1,2-bis(diphenylthiophosphinyl)ethane containing seven-membered metallacyclic rings

Cycloaurated triphenylphosphine-sulfide and -selenide

“…In other structurally characterised complexes where tertiary phosphine sulfides are coordinated to Hg(II) the S-Hg bond lengths range from 2.500 A ˚to 2.761 A ˚, and the P-S-Hg angles are in the range of 99.31-110.99 • . 24, 25 The P-S-Hg angle in 15 (86.58 • ) is extremely acute; most P-S-M angles in coordinated phosphine sulfides fall within the range of 102-116 • (see Table 3). The P(1)-S(1) bond length in 15 [1.9745(11) A ˚] is longer than in Ph 3 P=S (1.950 A ˚), 26 and the coordination around the mercury atom deviates slightly from linear geometry [C(12)-Hg(1)-Cl(1) angle 173.34 (9) • ].…”

Regioselective versus complete chalcogen transfer reactions of the bis(bidentate) phosphine cis,trans,cis-1,2,3,4-tetrakis(diphenylphosphino)cyclobutane: full characterization of new, hemilabile ligands and their complexes with palladium(ii) and platinum(ii)

“…42 4 is a rare example of seven-membered chelate ring formation among metal-phosphine sulfides or selenides, where the sevenmembered metallacyclic rings are interestingly stable and flexible similar to complexes of the disulfide of dppe. 43 However, since the relative donor-versus acceptor-strength follows the order P(O)Ph 2 < P(S)Ph 2 ≤ P(Se)Ph 2 , the lack of acceptor properties especially in the latter case leads to the instability of seven-membered ring systems. 44…”

Copper-sulfur interactions: synthesis and structure of a trigonal planar copper(I) complex with bis(diphenylthiophosphinyl)methane, [CuI(dppmS2)]·MeCN

“…Tertiaryphosphine sulfides and selenides have been the focus of several investigations for a variety of reasons, ranging from bonding and structural studies of their metal complexes to their extraction and catalytic properties [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Tertiaryphosphine sulfides generally form monomeric, dimeric or, in a few cases, trimeric complexes [1,2].…”