
TY  - JOUR
A1  - Donnelly, Paul S. 
A1  - Skelton, Brian W. 
A1  - White, Allan H. 
T1  - &#8216;Neutralmolek&#252;lcomplexe&#8217;&#8212;Structural Characterization of Some Adducts of Urea and Thiourea with <emph type="2">N,N&#8242;</emph>-Bidentate Aromatic Bases
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 2003
VL  - 56
IS  - 12
SP  - 1249
EP  - 1253
KW  - 
UR  - https://doi.org/10.1071/CH03015 
N2  - Oepen and V&#246;gtle in 1979 recorded the formation of a number of &#8216;neutral molecule complexes&#8217; between urea (ur) and/or thiourea (tu) and a number of N,N&#8242;-aromatic chelate bases derivative of 2,2&#8242;-bipyridine (bpy), motifs now widely utilized in essays in studies of molecular/crystal architecture. The structures are recorded of a number of their adducts, namely (a) bpy/ur (1 : 1), (b) phen/ur (1 : 1), (c) phen/tu (1 : 1), (d) dmp/ur (1 : 1), together with (e) bpy/tu (1 : 1) and (f) a dmp/tu adduct of 1 : 2 stoichiometry (phen = 1,10-phenanthroline; dmp = 2,9-dimethyl-1,10-phenanthroline). Association takes places in all cases by way of hydrogen-bonding interactions between alternating (thio-)urea NH2 groups which form an infinite band with the nitrogen atoms of the aromatic base at the periphery, the base planes quasi-normal to that of the band, as in the archetypical 2,6-lutidine/urea (1 : 1) array, described long ago. 
ER  -

