2-{3-Cyano-5,5-dimethyl-4-[4-(pyrrol­idin-1-yl)buta-1,3-dien­yl]-2,5-dihydro­furan-2-yl­idene}malononitrile dichloro­methane solvate

The structure of the title compound, C18H18N4O·CH2Cl2, was solved using data collected from a multiple crystal (note high R factors). The crystal structure is dominated by two bifurcated attractive C—H⋯N(cyano) inter­actions

2-(3-Cyano-4-{7-[1-(2-hy­droxy­eth­yl)-3,3-dimethyl­indolin-2-yl­idene]hepta-1,3,5-trien­yl}-5,5-dimethyl-2,5-dihydro­furan-2-yl­idene)malononitrile

The title compound, C29H28N4O2, excluding the hydroxyethyl and methyl groups, is slightly twisted from planarity so that the terminating indol-2-yl­idene and furan-2-yl­idene moiety planes subtend a dihedral angle of 6.27 (8)°. A small inwards fold in the polymethine atom chain is consistent with centrosymmetric dimer formation via O—H⋯N(cyano) hydrogen bonds. In the crystal, the mol­ecules pack in layers approximately parallel to the (10) plane via pairs of O—H⋯N and C—H⋯N(cyano) inter­actions

catena-Poly[sodium(I)-μ-tetra­butoxy­borato]

The title compound, [Na(C16H36BO4)]n, has a fourfold axis passing through the Na and B atoms which both are bound by four O atoms. The tetra­butoxy­borate anion provides the bridging to form one-dimensional polymers running along [001], just like those found for the tetra­ethoxy­borate structure. The two but­oxy ‘tail’ atoms are disordered over two conformations in a 0.887 (9):0.113 (9) ratio