Oxalatoborates
Chemical compounds containing oxalate-boron complexes
From Wikipedia, the free encyclopedia
Boro-oxalates, bis(oxalato)borates, or oxalatoborates are chemical compounds where an oxalate group is bound to a borate group via oxygen, forming a condensed anion. The oxalatoborates are heterocyclic compounds with a ring containing -O-B-O-C-C-. Bis(oxalato)borates are spiro compounds with two rings joined at the boron atom.
Oxalatoborates are used for research in lithium-ion battery electrolytes and for supercapacitors.
The borate oxalates are chemical compounds containing separate borate and oxalate anions. Compared to oxalatoborates, these are of little importance.
Production
Oxalatoborates have been produced by heating boric acid, oxalic acid and a metal oxalate, a metal carbonate or an amine in boiling benzene with continuous removal of water via azeotropic distillation.[1]
Properties
When heated, oxalatoborates decompose at around 320 °C to yield a metaborate, carbon monoxide, and carbon dioxide.[1]
List
| Name | Chemical formula | Molecular weight | Crystal system | Space group | Unit cell (Å) | Volume | Density | Comments | References |
|---|---|---|---|---|---|---|---|---|---|
| Lithium bis(oxalate)borate, LiBOB | LiB(C2O4)2 | 193.8 | orthorhombic | Pnma | a 6.3635 b 7.5998 c 13.1715 | [2] | |||
| lithium difluoro (oxalate) borate, LiDFOB | LiBF2(C2O4) | 143.8 | orthorhombic | Cmcm | a = 6.2623, b = 11.437, c = 6.3002, Z = 4 | 451.22 | [3][4] | ||
| lithium difluoro (oxalate) borate dihydrate | LiBF2(C2O4)•2H2O | monoclinic | P21/c | a = 9.5580, b = 12.7162, c = 5.4387, β =106.247 Z = 4 | 634.63 | [4] | |||
| ammonium bis(oxalato)borate | [1] | ||||||||
| tetramethylammonium bis(oxalato)borate | N(CH3)4B(C2O4)2 | [5] | |||||||
| triethylammonium bis(oxalato)borate | [1] | ||||||||
| pyridinium bis(oxalato)borate | [1] | ||||||||
| quinolinium bis(oxalato)borate | [1] | ||||||||
| 1-ethyl-3-methylimidazolium bis(oxalate)borate (EmimBOB) | ionic liquid | [6] | |||||||
| 1-Butyl-1-Methylpyrrolidinium bis(oxalate)borate; Bmpyr BOB | (C4H8N+)(CH3)(C4H10)[B(C2O4)2]− | ionic liquid | |||||||
| [(C2H5)4N][CF3B(OCH3)(C2O4)] | [7] | ||||||||
| [(C2H5)4N][CF3CF2B(OCH3)(C2O4)] | [7] | ||||||||
| [(C2H5)4N][CF3BF(C2O4)] | [7] | ||||||||
| [(C2H5)4N][CF3CF2BF(C2O4)] | [7] | ||||||||
| sodium bis(oxalato)borate, NaBOB | NaB(C2O4)2 | orthorhombic | Cmcm | a 8.12756( b 10.3399 c 7.8211 | [8][2] | ||||
| Trihexyltetradecylphosphonium bis(oxalate)borate | [9] | ||||||||
| [(C6H5)4P][CF3B(OCH3)(C2O4)] | 538.24 | triclinic | P1 | a 11.0744 b 11.5314 c 12.2196, α 73.427° β 69.395° γ 61.786° Z=2 | 1273.7 | 1.403 | [7] | ||
| [(C6H5)4P][CF3CF2B(OCH3)(C2O4)] | [7] | ||||||||
| [(C6H5)4P][CF3BF(C2O4)] | [7] | ||||||||
| [(C6H5)4P][CF3CF2BF(C2O4)] | 576.22 | monoclinic | C2/c | a 16.821 b 7.1612 c 21.519 β 101.981° Z=4 | 2535.6 | 1.509 | [7] | ||
| Lithium difluoro(oxalato)borate tetramethylene sulfone disolvate | Li+•C2BF2O4−•2C4H8O2S | monoclinic | P21/n | a = 13.9005 b = 5.8917 c = 19.9627 β = 106.010 Z=4 | 1571.48 | 1.623 | colourless | [10] | |
| rubidium bis(oxalato)borate | [1] | ||||||||
| caesium bis(oxalato)borate | [1] | ||||||||
| thallium bis(oxalato)borate | [1] | ||||||||
| Borate oxalates | |||||||||
| potassium boro-oxalate | K(C2O4)(BO2)2•2H2O | 248.77 | triclinic | P1 | a=6.3508 b=7.0095 c=10.590 α=93.798 β=101.424 γ=100.196 | 452.3 | 1.827 | NLO 1.56×KDP; stable to 187 °C | [11] |
| Pb6O2(BO3)2(C2O4) | 740.39 | orthorhombic | Cmcm | a=18.0445 b=6.6225 c=11.4682 Z=8 | 1370.45 | 7.177 | band gap 3.60 eV | [12] | |