preparation and crystal structure of n,n΄-bis(2,4-dimethoxybenzylidene)-butane-1,4-diaminemonohydrate

In this work, the schiff-base compound n,n΄-bis(2,4-dimethoxybenzylidene)- butane-1,4-diamine monohydrate ((2,4-meo-ba)2bn/h2o) was prepared by the condensation reaction of 2,4-dimethoxybenazaldehyde with butane-1,4- diamine in methanol solution and crystallizes as the monohydrate. the crystal structure of (2,4-meo-ba)2bn/h2o (1) was determined using the x-ray diffraction (xrd) analysis. the compound crystallized in the monoclinic space group c2/c, with a=14.7116 (10), b=15.7333 (9), c=10.2013 (6) å, β=112.704 (2)° and z=4. there are one half-molecule and one half of a water molecule in the asymmetric unit, with the (2,4-meo-ba)2bn molecule completed by inversion symmetry on the midpoint of the central c-c bond of the butane unit and the o atom of the water molecule situated on a twofold rotation axis. within the imine functionality, the n-c bond lengths of 1.2643 (19) and 1.457 (2) å were double and single bonds, respectively. hydrogen bonds of the type o-h∙∙∙n between the water molecule and the imine nitrogen atom of the (2,4- meo-ba)2bn molecules led to formation of the layers propagating parallel to (100). the 1h-nmr and ft-ir results confirmed the preparation of this ligand, as well.