Heavier N-heterocyclic half-sandwich tetrylenes

ansa-Half-sandwich complexes of the group 14 elements germanium, tin and lead are reported, which represent a new class of Lewis amphiphilic tetrylenes and bridge the gap between classical N-heterocyclic systems and group 14 metallocenes. These compounds can form complexes both with carbenes and transition metal fragments

Diphosphanylmetallocenes of Main-Group Elements

Several 1,1’-diphosphanyl-substituted metallo cenes of magnesium (magnesocenes) were synthesized, structurally characterized, and their reactivity and coordina tion chemistry were investigated. Transmetalation of these magnesocenes gives access to group 14 metallocenes (tetre locenes), as well as to group 15 stibonocenes. These s- and p-block metallocenes represent a novel class of bis(phos phanyl) ligands, exhibiting Lewis-amphiphilic character. Their coordination chemistry towards different transition-metal and main-group fragments was investigated and different complexes are presented

Bis(tetrelocenes) – fusing tetrelocenes into close proximity

We report the synthesis and structure of two bis(germanocenes) and a bis(stannocene), obtained by the reaction of unsymmetric ansa bis(cyclopentadienyl) ligands with germanium and tin dichloride. DFT calculations show that the formation of these bis(tetrelocenes) is energetically favoured over the formation of the corresponding [1]tetrelocenophanes. In the crystal structure authenticated structural motif, the two tetrel(II) centers are forced into close proximity to each other, resulting in weak donor–acceptor interactions, according to Natural Bond Orbital (NBO) and Atoms in Molecules (AIM) analyses