Complexes with platinum-hydrogen-silver bonds

Abstract

Crystallographic Procedures. Crystalline samples suitable for diffraction analysis were obtained as follows. Colorless crystals of 1 were obtained from benzene solution at room temperature. Light-yellow crystals of 2 were obtained from the reaction mixture in benzene at 5 °C. Colorless crystals of 3 and dark-red crystals of 5 were obtained from the respective reaction mixtures at -20 eC. Dark-purple plates of 6-THF were obtained from the reaction mixture in hexane at room temperature.All samples were mounted in thin-wall glass capillaries in an inertatmosphere glovebox. The intensity data for compounds 1, 3, and 5 were collected on a Siemens R3m/v diffractometer at ambient temperature. The data for 2 and 6 were collected on a Nicolet P3 diffractometer at ambient temperature. On both diffractometers, Mo Ka radiation (X = 0.71073 A) was used except in the case of 1 for which Cu Ka radiation was used (X = 1.541 78 A).Crystallographic calculations were done on a microVAX II using the Siemens SHELXTL PLUS program package. Crystal data are summarized in Table II. Neutral-atom scattering factors were used.55 All structures were solved by direct methods. On the basis of systematic extinctions or lack of them, the space groups were assigned to be PI (No.2) for 1-3, and 6, and P2,2I2, (No. 19) for 5. Refinements for each are described in the supplementary material. All non-hydrogen atoms were refined anisotropically. All hydrogen atoms were placed in calculated (55) International Tables for X-ray Crystallography; Hahn, T., Ed.

Anion-templated syntheses of octanuclear silver clusters from a silver dithiophosphate chain

“…2.525 A ˚); however, the averaged SÁ Á ÁS bite distance in 4 (3.471(4) A ˚) is comparable to those in its copper homolog [Cu 8 (H) {S 2 P(OEt) 2 } 6 ] + . 11 The averaged Ag-m 4 -H distance, 1.92(4) A ˚, is longer than 1.831(5) A ˚that is observed in [(PEt 3 ) 2 (C 6 Cl 5 )Pt(m-H)Ag(H 2 O)] + , 14 and the sum of the covalent radii (1.76(5) A ˚). 15 A C 3 rotational axis passing through the vertex of the tetrahedron, the central hydride, and a capping Ag atom opposite to the vertex, and three C 2 axes, each being co-linear with two opposite P atoms and the central hydride, constitute an idealized T symmetry for the cluster cation in 4.…”

H(C)Ag: a triple resonance NMR experiment for 109Ag detection in labile silver‐carbene complexes

“…109 Ag is generally the preferred isotope because of its slightly larger frequency ratio ( Ξ = 0.0465 compared with 0.0405 for 107 Ag), which is just at the edge of what many broadband probes can handle. As a consequence of the poor sensitivity, 109 Ag today is almost exclusively observed via ligand‐detected methods such as 1 H, 109 Ag‐INEPT and 1 H, 109 Ag‐HMQC, both of which rely on the presence of J ‐coupled protons close to the metal (typically within ≤4 bonds). Also, detection via 19 F or 31 P has been reported.…”

Nucleophilic behaviour of the neutral complexes [M(C ^ P)(S2CNMe2)] [M = Pd, Pt; C ^ P = CH2C6H4P(C6H4Me-o)2-κ-C,P ] towards Ag(I) and Au(I) compounds. Synthesis (M = Pd, Pt) and molecular structures (M = Pt) of polynuclear complexes containing M–Ag and M–S bonds

“…As far as we know, only a small number of Pt-Ag complexes involving neutral Pt() fragments have been described, 2-8 and structurally characterized. [4][5][6][7][8] In the latter complexes there are ligands bridging between the Pt and Ag atoms.…”