Synthesis and crystal structure of cis-[)Ph}2]-[BF4][B2F7]. Unexpected formation and first structural characterisation of the heptafluorodiborate anion B2F7−

Systematics of BX3 and BX2+ Complexes (X = F, Cl, Br, I) with Neutral Diphosphine and Diarsine Ligands

“…The cation features a BF 2 moiety with an almost symmetrically chelating Ph 2 P­(O)­CH 2 ­P­(O)­Ph 2 ligand, giving a slightly distorted tetrahedral boron center. The anion is a rare example of a crystallographically authenticated [B 2 F 7 ] − salt. , It is composed of a single fluorine atom bridging between two BF 3 fragments, with the terminal d (B–F) ranging from 1.326(7) to 1.406(7) Å, while the bridging d (B–F) values are 1.499(7) and 1.532(8) Å and the B2–F6–B3 angle is 128.6(4)°, consistent with the literature. The reaction was repeated varying the [BF 3 (SMe 2 )]/Ph 2 P­(O)­CH 2 ­P­(O)­Ph 2 ratio, but always produced mixtures of the two complexes, although in varying amounts, and fractional crystallization failed to separate bulk quantities of the ionic species, which is clearly in equilibrium with the dimer in solution.…”

Theoretical and Synthetic Study on the Existence, Structures, and Bonding of the Halide-Bridged [B2X7]−(X = F, Cl, Br, I) Anions

“…At room temperature this small energy barrier allows free rotation about the bridging B–X bonds. In the solid state, however, packing forces determine the actual crystal structures. − The computed structural properties of the C 2 -symmetric [B 2 X 7 ] − anions are listed in Table .…”

“…In most cases the anion possesses C s symmetry, but a C 2 -symmetric structure has also been observed (Scheme ). In contrast to the fluoro anion [B 2 F 7 ] − no reports on the related [B 2 X 7 ] − anions, containing the other halogens chlorine, bromine, and iodine, can be found in the literature.…”

Synthesis of η6-arene complexes of molybdenum containing β-ketophosphine and related P,O mixed donor ligands

“…[34][35][36][37] However, a slight variation in the bite angle of the phosphinoenolate ligand is observed between the square planar Group 10 complexes (P-M-O = 82-87Њ) and the Mo() d 4 complexes (P-Mo-O = 75-76.3Њ). The PCCO bite angles observed for the phosphinoenolate complexes are similar to the bite angles of 74.76(4) and 74.37(9)Њ observed in [MoCpCl 3 {Ph 2 PCH 2 C(O)NPh 2 -κ 2 P,O}] [74.76(4)Њ] and [Mo-Cp*Cl 3 {Ph 2 PCH 2 C(O)NPh 2 -κ 2 P,O}][BF 4 ], respectively.…”