Experimental. SADABS-2012/1 (Bruker,2012) was used for absorption correction. wR2(int) was 0.0545 before and 0.0502 after correction. The Ratio of minimum to maximum transmission is 0.9200. The λ/2 correction factor is 0.0015.

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.