S- and Se- Donor Ligands

S- and Se-Donor ligands. Synthesis of the dimers [IrX(SAr)(SAr )(CO)(PPh3)]2 (X = Cl, Br, or I Ar = p-substituted benzene Ar = 2,4-(N02)2C6H4 has been described (equation 49), spectroscopic studies suggesting the bridged structure (56).237 

Thiosalicylamide (L) has been shown to be a useful reagent for the gravimetric or spectrophotomeric determination of Irm, reacting with such salts in acetate buffer (pH 4.6—5.8) to give a quantitative precipitate of the orange-yellow [IrL3].238 The 

The cations Zr ms-[IrX2(py)4]+ (X = Cl or Br) have been isolated with the unusual anions Cl3, Br2Cl , and C104, MeN02.191 For example, chlorination of trans-[Ir(py)4Cl2]Cl yielded [Ir(py)4Cl2]Cl3 in which the presence of Cl3 was confirmed from i.r. and Raman data. 

The novel pale-yellow [Ir(bipy)3](N03)3 has been synthesized and its structure confirmed by H and 13C n.m.r.244 Its luminescence was also recorded at 77 K, the 

Treatment of Na3[IrX6] (X = Cl or Br) with ligand (HL = 58)in2-methoxyethanol has afforded the new complexes [IrXL]2.246 Comparison of their i.r. and 1H n.m.r. spectra with known Rh111 analogues indicated that the ligand is metallated by IrHI, and co-ordinated via the N-l and C-10 atoms as in structure (59). The chloro-bridge is 

S- and Se-Donor Ligands. Molybdenum(vi) and tungsten(vi) thio- and seleno-halide complexes are described on p. 153. 

The preparations of Cu2[WS4] and (HL)2[MoS J (L = a guanidine) have been described, the conditions under which [MoO S4 ] ions are prepared in HjO have been investigated, and the thermal decomposition of(NH4.)2[Mo02S2] and(NH4.)2[MS4](M = Moor W) has been described. Vibrational studies of salts containing the ions [MO S4 ] (M = Mo or W n = 1—4) and [MO Se4 ] (M = Mo or W m = 2 or 3) have been presented and the data obtained were discussed with reference to photoelectron spectral data measured for these ions. The electronic spectra of the charge-transfer transitions in [MoS Se4 ] ( = 2, or 3) and [WSSej] have 

Kanatomi, I. Murase, and A. E. Martell, J. Inorg. Nuclear Chem., 1976,38,1465. 

Yamada, K. Yamanouchi, W. Mori, and M. Kishita, Bull. Chem. Soc. Japan, 1976,4S, 2111. 

VOSO4 reacts with morpholine-4-carbodithioate [mdtc (4)] (1 2) in aqueous solution, pH 4, to form a dull-brown compound which is unstable and slowly 

The exclusive example ofa direct formal gold(I)-gold(III) bond (2.769(1) A) described [ Au(CH2)2PPh2 2Au(C6F3)3[ [12, 232, 233] can be prepared by the displacement of the diethylether molecule of [Au(C6E5)3(OEt2)] and a posterior coordination to the 

Many heteropolynuclear Au(III)/Ag derivatives have been described in the previous Section 3.2. 

Mixed gold] III) and molybdenum or tungsten derivatives can be obtained by ligand displacement or bridge-cleavage reactions. Thus, treatment of [M]CO)4]tdppme)] 

The thermally stable tripodal tris]amido)methalates of the group 14 element can act as metal building blocks [239, 240] in the synthesis of heterometallic systems 

In mononuclear and polynuclear Au(CgF5)3 compounds (Tables 3.12 and 3.13 respectively) the Au-C Fs bond lengths in the fragments mutually in trans position are in the same range and the remaining Au(C6F5) displays different distances depending 

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S and Se-Donor Ligands. The potentially terdentate ligand thiodiethanol, S(CH2CH20H)2, forms navy-blue [Cr S(CH2CH20H)2 Cl2] on refluxing... 

S- and Se-donor ligands. The e.s.r. and electronic spectra of [Co(sacsac)2] and [Co(sacsac)2L] (sacsac = dithioacetylacetonate, L = py or piperidine) have been studied, and a polarographic study of [Co(sacsac)J (n = 2 or 3) in acetone has shown the complexes to have a well-defined capacity to accept one or two electrons in a reversible stepwise manner. The magnitude of the potentials and their reversible nature suggest that isolation of cobalt-sacsac complexes of low formal oxidation states should be possible." Co complexes of l,5-bis-(2-methylmercaptoethylthio)pentane are both hydrated and polymeric, and thermal decomposition in air or nitrogen leads to oxida tion to Co . Ethylenethiourea (etu) and tetramethylthiourea (tmtu) form the complexes [Co(etu) ](N03)2 and [Co(tmtu) ](C10 )2, which are tetrahedral, and [Co(etu)2(N03)2] and [Co(tmtu)2(N03)2] which have distorted octahedral co-ordination. 3-Diphenylphosphinothioyl-l-phenylthiourea, -1,1-diethyl-thiourea, and -1,1-dimethylthiourea form complexes with Co in which the ligands are bidentate. ... 

S- and Se-Donor Ligands. The majority of the reported work once more relates to dithiocarbamate and related ligands, and some novel selenium work has appeared. 

S- and Se-Donor Ligands. Magnetic data (down to liquid helium temperatures) confirm the dinuclear structure of [Cu(dtc)X]2, e.g. (143). The stoicheiometry of the... 

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