The crystal structure of methyl 1,4-di[(E)-2- (p-tolyl)-1-diazenyl]piperazine (4) has been determined by single crystal X-ray diffraction analysis. The bis-triazene (4) adopts a normal chair conformation in the piperazine ring, with puckering parameters : u2 =-29(5)°,QT = 0.534(2) A and theta2 = 177.0(2)°. The crystal structure of 4 is compared with the structure of the triazene (2a) and the closely related bis-triazenes (3 and 5a). The piperazine ring of 2a and 4 adopt a typical chair conformation, whereas the piperazine ring of 3 adopts an unusual pseudo-boat confor- mation. Crystal data: 4 C18H22N6, triclinic, space group P1, a = 6.8925(2) A , b = 7.8574(3) A , c = 16.8856(8) A , a = 103.103(2)°, b = 90.528(2)°, c = 101.776(2)° and V = 870.44 (6) A^3 , for Z = 2.
An X-ray Crystallographic Study of 1,4-Di[(E)-2-(p-tolyl)-1- diazenyl]piperazine
BERTOLASI, Valerio;
2010
Abstract
The crystal structure of methyl 1,4-di[(E)-2- (p-tolyl)-1-diazenyl]piperazine (4) has been determined by single crystal X-ray diffraction analysis. The bis-triazene (4) adopts a normal chair conformation in the piperazine ring, with puckering parameters : u2 =-29(5)°,QT = 0.534(2) A and theta2 = 177.0(2)°. The crystal structure of 4 is compared with the structure of the triazene (2a) and the closely related bis-triazenes (3 and 5a). The piperazine ring of 2a and 4 adopt a typical chair conformation, whereas the piperazine ring of 3 adopts an unusual pseudo-boat confor- mation. Crystal data: 4 C18H22N6, triclinic, space group P1, a = 6.8925(2) A , b = 7.8574(3) A , c = 16.8856(8) A , a = 103.103(2)°, b = 90.528(2)°, c = 101.776(2)° and V = 870.44 (6) A^3 , for Z = 2.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
