The internal complex palladium 2,4-dimethyl-8hydroselenoquinolinate Pd[C 9 H 4 (CH 3 ) 2 NSe] 2 (I) has been synthesized in the course of study of the complexing activity of 8hydroselenoquinoline and investigation of the nature of chemical bond metal-selenium in the five-membered metal-containing ring. X-ray diffraction data for I: Monoclinic, space group P2 1 /n, a = 9.0092(4), b = 16.3290(7), c = 14.1073(6) Å,  = 106.710(2) o , V = 1987.7(2) Å 3 , Z = 4, R1=0.0477, wR2=0.1182 for 4499

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... ions (diffractometer Bruker-Nonius KappaCCD, MoK  ). The crystal structure of the complex I is formed by neutral asymmetric molecules Pd[C 9 H 4 (CH 3 ) 2 NSe] 2 in which the central atom palladium is connected bidentically (Se,N) with two 2,4dimethyl-8-hydroselenoquinoline ligands. The structure of palladium coordination polyhedron is cis-square (2Se+2N) somewhat tetrahedrally distorted. Dihedral angle between the SePdN / SePdN coordination planes is 20.15(1) o . The Pd-Se and Pd-N bonds are covalent. The transition of trans-(complex Pd(C 9 H 6 NSe) 2 (II) to cis-coordination (complex I) causes the weakening of the Pd-N bonds (compare 2.162(5) and 2.159(5) Å (I) , 2.065(3) Å (II) ).