The microwave spectrum, structure and nuclear quadrupole coupling constants for stibabenzene

Abstract

The microwave spectrum of 121.SbCsHs, 123~SbCsH, p-dideutero 121-SbCbH3Dz and 123.SbCjHaDz has been assigned in the region 26.5-40.0 GHz. The respective rotational constants and uncertainties are:

Synthesis and Spectroscopic and Structural Investigations of the 2,3,4,5-Tetraethylarsolides and -stibolides of the Alkali Metals Sodium, Potassium, Rubidium, and Cesium

“…This is a consequence of an increasing size of the p-orbitals at E and results in a loss of overlap with the carbon-centered π-system. Therefore the Sb−C bonds (average Sb−C bond length for 2a to 2d : 2.10 Å) are clearly longer than observed for a SbC double bond (2.06 Å), calculated for stibaethene H−SbCH 2 (2.01 Å) or found for stibabenzene (stibinine, 2.05 Å) . On the other hand, similar discrepancies are also valid even for the phospholides (average P−C bond length for the phospholides: 1.764 Å, Table ); in comparison to phosphaethene (1.673 Å) and to phosphabenzene (phosphinine, 1.73 Å) larger P−C distances are found for the alkali metal 2,3,4,5-tetraethylphospholides.…”

Synthesis and Structure of Semi(tetrahydrofuran-O)bispotassium Bis(2,3,4,5-tetraethylstibolide)

“…As expected, the shortening of the Sb−C bond lengths compared to single bonds is less pronounced. On the other hand these bonds are clearly longer than observed for a SbC double bond (2.06 Å), calculated for stibaethene H−SbCH 2 (2.01 Å) or found for stibabenzene (stibinine, 2.05 Å) . Surprisingly, the Sb1−C11 and Sb1−C14 bond lengths of 2.085(8) and 2.087(7) Å are smaller than the values for Sb2−C21 (2.115(8) Å) and Sb2−C24 (2.100(7) Å), although the linkage between the columns leads to a higher coordination number at Sb1.…”

Synthesis and Structural Characterization of a Novel Polyheterocyclopentadienyl Thallium(I) Complex

“…The bond lengths within the diphosphastibolyl rings suggest full delocalization, as the antimony−carbon distances 2.03(3) Å (Sb(21)−C(25)) and 2.05(2) Å (Sb(1)−C(5)) compare well with those in other delocalized systems, e.g. 2.050(5) Å in stibabenzene . Similarly, the phosphorus−carbon bond lengths of 1.75(3) Å (C(25)−P(24)), 1.68(2) Å (C(23)−P(24)), 1.79(3) Å (C(23)−P(22)), 1.77(3) Å (C(3)−P(4)), 1.71(3) Å (C(3)−P(2)), and 1.74(2) Å (C(5)−P(4)) are all similar to that of 1.75 Å reported by Becker et al for the related delocalized triphospholyl anion [1,2,4-P 3 C 2 Bu t 2 ] - .…”

“…The bond lengths within the diphosphastibolyl rings suggest full delocalization, as the antimony-carbon distances 2.03(3) Å (Sb(21)-C(25)) and 2.05(2) Å (Sb(1)-C(5)) compare well with those in other delocalized systems, e.g. 2.050(5) Å in stibabenzene 7. Similarly, the phosphorus-carbon bond lengths of 1.…”