The structure of triphenylmethanol, Ph3COH

Structures of 1-ferrocenyl-1-phenylethanol, ferrocenyl(diphenyl)methanol and ferrocene-1,1'-diylbis(diphenylmethanol)

“…Triphenylmethanol, Ph3COH, crystallizes as hydrogenbonded tetrameric aggregates with threefold crystallographic symmetry, each containing an approximately tetrahedral arrangement of O atoms with necessarily disordered hydroxyl H atoms (Ferguson, Gallagher, Glidewell, Low & Scrimgeour, 1992). These aggregates are significantly different from the cyclic tetrameric aggregates found in triphenylsilanol, Ph3 SiOH (Puff, Braun & Reuter, 1991), and in triphenylgermanol, Ph3GeOH (Ferguson, Gallagher, Murphy, Spalding, Glidewell & Holden, 1992), whose graph set (Etter, MacDonald & Bemstein, 1990) is R~4(8).…”

Molecules isoelectronic with triphenylmethanol: diphenyl(4-pyridyl)methanol and triphenylmethylamine

“…the aromatic C--C distances are in the range lo.362 (10)-1.393 (7),~, with a mean value of 1.378 (10) The structure of compound (II) consists of isolated molecules (Fig. 2); the C--N distance is 1.481 (3),~, (slightly above the upper quartile value of 1.476 A for primary amines) and the Csp3 mC(aryl) distances are essentially identical in the range 1.539 (3)-1.541 (3)A, again somewhat above the upper quartile value of 1.521 ,~,, and significantly longer than the corresponding distances in triphenylmethanol [range 1.509 (14)-1.522 (10) ,~, mean 1.514 A (Ferguson, Gallagher, Glidewell, Low & Scrimgeour, 1992)]. The aromatic C--C distances are in the range ol.357 (5) The conformation of (II) is such that there is almost perfect staggering of the fully ordered N--H bonds and the C1--Cnl bonds (where n = 1, 2 or 3).…”

“…Triphenylmethanol crystallizes as almost perfectly tetrahedral tetramers, with the four hydroxyl H atoms presumably disordered over the six O...O edges (Ferguson, Gallagher, Glidewell, Low & Scrimgeour, 1992). Despite the exact match of the number of hydrogen-bond donors and hydrogen-bond acceptors in this tetrameric system, a structure is adopted which cannot have one O-H.. • O hydrogen bond per O...O atom pair.…”

Intermolecular N—H...N and C—H...O interactions from one-dimensional chains comprising the two independent molecues ofN,N'-dicyclohexyl-N-nicotinoylurea

“…Crystal structures with more than one molecule present in the asymmetric unit are not uncommon (Gallagher et al, 1998) and we have reported previously structures with more than one molecule in the asymmetric unit in space groups R3 (Ferguson et al, 1992) and PI (Butler et al, 1998) ecules is difficult (Karthe et al, 1993). These may arise due to the existence of dimers or oligomers in solution (with energetically similar conformations arising from intramolecular hydrogen bonding, solute/solvent interactions etc.)…”