Germanium–transition-metal bonds: the importance of the leaving group in the preparation of metal-metal bonded compounds by nucleophilic displacement reactions

Platinum Complexes Bearing a Tripodal Germyl Ligand

“…In general, covalent Pt–Ge bonds can be generated, for example, by salt metathesis reactions involving a platinum halide salt and a metal germyl compound or by the oxidative addition of a germane to a platinum complex. [14a], For example, in the 1960s Cross and Glockling reported on the synthesis of [Pt(PEt 3 ) 2 (GePh 3 ) 2 ][14a] by salt metathesis, and more recently Holl and co‐workers described the formation of [Pt(PEt 3 ) 2 (Ge{N(SiMe 3 ) 2 } 2 )] in which a platinum(0) center is formally coordinated by the Lappert germylene [Ge{N(SiMe 3 ) 2 } 2 ]. [14b] Herein, we describe the synthesis and properties of various platinum complexes bearing a tripodal germyl ligand of the type [Ge(2‐C 6 H 4 PPh 2 ) 3 ] – .…”

The influence of an acetyl group on the cyclopentadienyl ring in the formation of Sn-Mo(W) complexes by nucleophilic displacement reactions, crystal and molecular structure of CH3COC5H4(CO)3MoSnPh2Cl

“…The leaving group of a main group metal like Ge has great influence on the result of the preparation of transition metal-Ge bonded complexes, as mentioned above [3]. We have reported [7] that when a dialkyl or diaryl dichlorostannane was reacted with the complex anion of tungsten containing a cyclopentadienyl or a more electron-releasing group, methyl-cyclopentadienyl, it was easy to obtain W-Sn-W bonded trimetallic complexes and difficult to control the partial displacement of halogen to obtain the bimetallic complexes when the tungsten anion was in excess.…”

“…When the CH 3 COC 5 H 4 -Mo(CO) 3 anion reacted with Ph 2 SnX 2 , no matter whether X‫ס‬Cl or Br, only one halogen atom was displaced, and no trimetallic complexes were found. The bimetallic complexes Ph 2 Sn(Cl)M(CO) 3 C 5 H 4 -COCH 3 and Ph 2 Sn(Br)M(CO) 3 C 5 H 4 COCH 3 (M‫ס‬Mo, W) were obtained.…”

“…Nucleophilic displacement reactions are some of the convenient and useful methods [12]. Cleland et al [3] studied such reactions and found the type of leaving group on the main group metal to be of importance. When the transition metal complex anion reacted with Ph 2 GeX 2 (X‫ס‬Cl, Br), only Cl was displaced to yield the bimetallic complex, even with a fourfold excess of the anion, whereas for X‫ס‬Br, two Br atoms were displaced to give the trimetallic complex.…”