Sodium bis(2-methyllactato)borate

Govindharajan Gokila,Chidambaram Ramachandra Raja,Aravazhi Amalan Thiruvalluvar

doi:10.1107/s2414314619005935

Abstract

The asymmetric unit of the title organic–inorganic hybrid salt, poly[[μ4-bis(2-methyllactato)borato]sodium], [Na(C8H12BO6)] n , comprises a sodium cation and a bis(2-methyllactato)borate anion. The sodium cation exhibits a [4 + 1] coordination by borate and carbonyl O atoms of the bis(2-methyllactato)borate anion, leading to a three-dimensional polymeric structure.

Highlights

The asymmetric unit of the title organic–inorganic hybrid salt, poly[[4-bis(2methyllactato)borato]sodium], [Na(C8H12BO6)]n, comprises a sodium cation and a bis(2-methyllactato)borate anion
Whereas other alkaline bis(2-methyllactato)borate salts crystallize as hydrates (Li as a monohydrate, Allen et al, 2012; K as a hemihydrate, Gokila et al, 2019a; Rb as a monohydrate; Golika et al, 2019b), the title sodium salt is anhydrous
The sodium cation is surrounded in a pseudotetrahedral manner by four O atoms (O1, O4i, O6iii and O6ii; for symmetry codes: see Table 1) at short distances

Summary

Structure description

Alkaline cations such as lithium, potassium and sodium, together with different anions, are used in the development of rechargeable batteries. Allen et al (2012) have reported the structure of lithium bis(2-methyllactato)borate monohydrate. Allen et al (2012) have reported the structure of lithium bis(2-methyllactato)borate monohydrate. In our current investigation we have replaced lithium by sodium and report here the growth and structural analysis of sodium bis(2-methyllactato)borate, [Na(C8H12BO6)]n, prepared by the slow evaporation method. Whereas other alkaline bis(2-methyllactato)borate salts crystallize as hydrates (Li as a monohydrate, Allen et al, 2012; K as a hemihydrate, Gokila et al, 2019a; Rb as a monohydrate; Golika et al, 2019b), the title sodium salt is anhydrous. The asymmetric unit of the title compound comprises a sodium cation and a bis(2methyllactato)borate anion (Fig. 1). The sodium cation is surrounded in a pseudotetrahedral manner by four O atoms (O1, O4i, O6iii and O6ii; for symmetry codes: see Table 1) at short distances. [Na(C8H12BO6)] 237.98 Monoclinic, P21/n 296 10.1398 (5), 10.8359 (6), 11.2588 (5) 115.687 (3) 1114.80 (10) 4 Mo K 0.15 0.20 Â 0.20 Â 0.15

Data collection Diffractometer Absorption correction

Bruker APEXII CCD diffractometer

Special details