Related Experiment Video
Updated: May 11, 2026

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
Published on: August 22, 2018
[(2R,3S)-Butane-1,2,3,4-tetraol-κ(3) O (1),O (2),O (3)](ethanol-κO)tris-(nitrato-κ(2) O,O')samarium(III)
Jun-Hui Xue1, Xiao-Hui Hua, Li-Min Yang
1Chemical Engineering College, Inner Mongolia University of Technology, People's Republic of China.
Abstract:
The title Sm(III)-erythritol complex, [Sm(NO3)3(C2H6O)(C4H10O4)], is isotypic with its Nd, Eu, Y, Gd, Tb and Ho analogues. The Sm(III) cation exhibits a coordination number of ten and is chelated by a tridentate erythritol ligand and three bidentate nitrate anions. It is additionally coordinated by an O atom of an ethanol mol-ecule, completing an irregular coordination sphere. The Sm-O bond lengths range from 2.416 (2) to 2.611 (2) Å. In the crystal, extensive O-H⋯O hydrogen bonding involving all hy-droxy groups and some of the nitrate O atoms links the mol-ecules into a three-dimensional network.
Related Concept Videos
Naming Enantiomers
Stereoisomerism
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Chirality at Nitrogen, Phosphorus, and Sulfur
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
Acidity and Basicity of Alcohols and Phenols
Structure and Nomenclature of Ethers
Ethers are organic compounds with an ether functional group which is characterized by an oxygen atom connected to two — identical or different — alkyl, aryl, or vinyl groups. The C–O–C linkage in dimethyl ether — the simplest ether — has an approximately tetrahedral bond angle of 110.3 degrees. The oxygen atom is sp3- hybridized, with the C–O distance being about 140 pm.
Classification of Ethers
Based on their attached substituent groups, ethers can be classified into two...
Conformations of Butane

