Crystal engineering with urea and thiourea hydrogen-bonding groups.
The utilization of N,N'-disubstituted ureas and thioureas as design elements in the synthesis of crystalline organic solids is reviewed. These hydrogen-bonding units are versatile yet predictable building blocks that can be rationally employed in both crystal assembly and functionalization.
Custelcean
Radu
R
Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6119, USA. custelceanr@ornl.gov