Molecular and crystal structure of ortho-tellurated azomethines with intramolecular N → Te coordination

摘要: Abstract Novel reactions have been discovered and studied of Caliph.–Te bond scission in o-butyltellurobenzalanilines under the action halogens, which afford 2-halogenotellurenyl- 2-trihalogenotellurobenzalanilnes high yields. The series azomethines synthesized with different tellurium-containing groups o-positions respect to CN bond. effects structural factors upon length N → Te intramolecular coordination bonds by following methods: X-ray determinations, dipole moments, 1H 125Te NMR spectroscopy IR spectroscopy. In TeII derivatives, shortest N→ contact (2.23 A) is formed 2-chlorotellurenyl derivatives XIIIb. Bis(2-formylphenyl)tellurium imines XIVa exist crystal form as 10-Te-3 telluranes, long fractional (2.70–2.72 detected, basicity imine atom no practical effect on their length. spectrum 15N labelled bis[2-(phenyl)iminomethinylphenyl]telluride shows that solution this compound a very fast (on an timescale), Te–N ← scrambling occurs owing dynamic equilibrium between topomeric structures apparently takes place via 12-Te-4 tellurane intermediates. Teiv derivative, (2-phenyliminomethinyl-phenyl)butylmethyl telluronium perchlorate, belongs longest (2.75 A). For first time, 125Te–15N spin-spin coupling constants are reported for number o-tellurated azomethines.