Formation of (vinyl-ferrocenyl)stibines involving β-elimination: Hypervalent Sb–N bonding

New 1,2-disubstituted ferrocenyl stibines containing N-heterocyclic pendant arm: Sb–N hypervalent compounds

“…Selected bond lengths and angles for all compounds are listed in Table 2. The average Sb-C (ferrocenyl) bond length found in these ferrocenylstibines is 2.123 Å, which is slightly shorter than that Sb-C (phenyl) bond length, the same observation was reported earlier also [14,15]. All these compounds possess planar chirality.…”

“…Very recently, ferrocenylstibines containing 2-dimethylaminomethyl and 2-dimethylaminoethyl side chains have been reported. In the molecular structures of these ferrocenylstibines, Sb-N hypervalent interactions were observed [14][15][16].…”

Tris-(1,2-N,N-dimethylaminomethylferrocenyl)stibine and its heterotrimetallic complex

“…Selected bond lengths and angles for all compounds are listed in Table 2. The average Sb-C (ferrocenyl) bond length found in these ferrocenylstibines is 2.123 Å, which is slightly shorter than that found in the other known tertiary stibines containing Sb-C (aryl) bond, this observation was also reported earlier [17,18]. It is to be noted that tris(1,2-aminomethylferrocenyl)stibine representing the first example of a structurally characterized ferrocenyl pnictogen where three 1,2-disubstituted ferrocenyl rings are attached to the central antimony atom and phosphorus analogue of this stibine is still missing in the literature.…”

“…This hypervalent Sb-N interaction was not observed in other two compounds (2) and (3). The structure is very similar to chloro-bis(N,N-dimethylaminoethylferrocenyl) stibine reported earlier, where Sb-N distance is slightly longer 2.584(5) Å [18]. In this compound, the geometry about antimony atom is distorted pseudo trigonal bipyramid.…”

“…There are many reports on the silicon, aluminum, and tin substituted FcN derivatives [14][15][16]. Recently our group has reported the first ferrocenylstibines containing 2-dimethylaminomethyl-and 2-dimethylaminoethyl-side chains and Sb-N hypervalent interactions were observed in their molecular structure [17,18]. In view of the existence of a few reports in the literature on ferrocene bonded antimony and our interest in functionalized triarylstibines ligands, especially those comprising triple substitution in ortho-positions [7,[19][20][21] and considering the unique stereoelectronic properties of the ferrocene framework for the synthesis of new ferrocenylstibine dendrimers, here, we wish to report the synthesis and structural characterization of new tertiary chloro-bis(1,2-ferrocenyl)stibine (2), tris(1,2-ferrocenyl)stibine ligand (2) and heterotrimetallic platinum complex of stibine (2).…”