Crystal structure of a CoII coordination polymer: catena-poly[[μ-aqua-bis­(μ-2-methyl­propano­ato)-κ2 O:O′;κ2 O:O-cobalt(II)] monohydrate]

The present paper describes the synthesis and crystal structure of a cobalt(II) isobutyrate dihydrate, based on a slightly distorted CoO6 repeat unit comprising four bridging carboxyl­ate O-atom donors and two bridging water donors, giving one-dimensional polymeric chains with composition {[Co{(CH3)2CHCO2}2(H2O)]·H2O}n. Hydrogen bonding through the water mol­ecules gives two-dimensional sheets lying parallel to (100).
In the title cobalt(II) coordination polymer with isobutyrate ligands, {[Co{CH(CH3)2CO2}2(H2O)]·H2O}n, the Co2+ ion is hexa­coordinated in a slightly distorted octa­hedral coordination environment defined by two O atoms from two bridging water mol­ecules and four O atoms from four bridging carboxyl­ate ligands. The carboxyl­ates adopt two different coordination modes, μ-(κ2 O:O′) and μ-(κ2 O:O), forming a one-dimensional polymeric chain extending along [010]. The intra-chain cobalt⋯cobalt separation is 3.2029 (2) Å. The polymeric chains are linked by hydrogen bonds involving the water mol­ecules of solvation, giving a two-dimensional network structure lying parallel to (100).