π-Bonding in three-co-ordinate beryllium compounds. Structure of tetra-µ-t-butoxydichlorotriberyllium

Abstract

The crystal structure of the title compound shows that the three beryllium atoms are collinear with adjacent beryllium atoms linked by two bridging t-butoxy groups, so that while the central beryllium is four-co-ordinate the terminal beryllium atoms are three-co-ordinate by also bonding to a terminal chlorine atom; the short bonds around the terminal beryllium atom are supportive of some degree of v-bonding and the co-planarity of beryllium and its three attached atoms will tend to maximise any such dative interaction.

Beryllium‐Induced Conversion of Aldehydes

“…The hydroxy group acts as m 2link while the oxygen atom of the carbonyl group completes the tetrahedral coordination around the Be atom ( Figure 2). [31] The BeÀO atomic distance to the carbonyl group is 1.655(4) ,t hus longer than that reported for Be(acac) 2 [1.62 (1) ]. [31] The BeÀO atomic distance to the carbonyl group is 1.655(4) ,t hus longer than that reported for Be(acac) 2 [1.62 (1) ].…”

“…The BeÀOa tomic distances within the four-membered ring are 1.591(4) and 1.616(4) ,w hich is comparable to the values found in 6 and those reported for tetrakis(m 2 -t-butoxy)-dichloro-tri-beryllium [from 1.540(2) to 1.635 (2) ]. [31] The BeÀO atomic distance to the carbonyl group is 1.655(4) ,t hus longer than that reported for Be(acac) 2 [1.62 (1) ]. [20] The BeÀI atomic distance is 2.390(4) ,t hus within the standard deviation identicalt ot hose of 6.C ompound 11 is obtained by cleavage of HI after the aldol addition and subsequent coordination towards "BeI + ".…”

Preparation and Molecular Structure of a Cyclic Bisgermylene with two Lutidine Bridging Groups

“…An X-ray diffraction study with crystals of 2 shows the molecule to reside on a crystallographic inversion center. The molecule exhibits C i -symmetry and is not planar (Figure 1) in contrast to the molecular geometry observed for the precursor tetraimine 1 [14]. The transamination reaction of 1 equiv.…”

“…Molecular structure of 2. Selected bond lengths /Å and angles /°: N1ϪC1 1.3924(14), N1ϪC7 1.447(2), N2ϪC2 1.3935(14), N2ϪC8 1.450(2), N3ϪC9 1.3421(14), N3ϪC13 1.3435(15); C1ϪN1ϪC7 122.07(10), C2ϪN2ϪC8 122.18(10), C9ϪN3ϪC13 118.86(10).…”

Three‐Coordinate Ligand for Physiological Beryllium Imaging by Fluoresence

“…Previous research has included binding of beryllium by bidentate ligands to make [BeL] and [BeL 2 ] species with chelating ligands such as chromotropic acid and 2,3-dihydroxybenzoic acid, which was initially designed for polynuclear [Be 2 L] complexes. [13][14][15][16][17][18] Recent work has suggested that Be binding occurs through the displacement of strong hydrogen bonds. [19] Strong hydrogen bonds occur when the distance between the two heteroatoms, typically OÀH···O or OÀH···N, is shorter than the sum of the van der Waals radii and the energy barrier to hydrogen transfer between two atoms is on the order of the O À H vibrational zero-point energy.…”