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crystal data
Unlike the position with negatively charged substituents, little has been done on benzaldehydes ortho-substituted with positively charged groups. This is more especially true in the field of crystallography where only the X-ray and neutron diffraction study of o-nitrobenzaldehyde has been reported [Coppens & Schmidt, Acta Cryst. (1964). 17, 222-228; Coppens, Acta Cryst. (1964). 17, 573-578]. Preliminary results of a structural investigation on Se- and Te-containing benzaldehydes are presented. The main purpose is to corroborate and to complete the conclusion of recent n.m.r. work on the conformation of these molecules [Baiwir, Llabres, Denoel & Piette, Mol. Phys. (1973). 25, 1-7]. The following compounds have been studied: C6H4.COH.TeCl, C6H4.COH.TeBr, C6H4.COH.TeI, C6H4 COH.SeCl, C6H4.COH.SeBr. The crystal structure of the second (TeBr) has been recently reported [Baiwir Llabres, Dideberg, Dupont & Piette, Acta Cryst. (1974). B30, 139-143] and the structure of the last (SeBr) is presently in the final stage of refinement.