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In contrast to dialkyl cyanamido complexes, the reactivity of hydrogen cyanamido/cyanoimido complexes reported so far occurs only at the N atom of cyanoimido or hydrogen cyanamido moieties, but not at the C atom. Herein we report the reaction of an osmium(VI) nitrido complex that bears a tridentate Schiff base ligand, [OsVI(N)( L1)(Cl)-(H2O)] (1 ), with CN under various conditions to afford(PPh4) [OsVI(N)( L1)(CN)(Cl)] ( 2 ), (PPh4)2[OsVI(N)( L2)(CN)2]( 3 ), and (PPh4)2[OsIII{N(H)CN}( L3)(CN)3](4 ). Electrophilic attack of 4 on the Nb atom of the hydrogen cyanamideligand by H+ or MeI readily occurs to produce (PPh4) [OsIII-{NCN(R)2}( L3)(CN)3 ](R = H(5 ); R = Me (6 )). More signifi-cantly, 4 readily undergoes nucleophilic attack at the C atom of the hydrogen cyanamide ligand by a variety of amines to produce a series of novel osmium guanidine com-pounds (PPh4) [OIII{N(H)C (NH2 )NR1R2}( L3)(CN)3](R1=R2= H(7 ); R1= H, R2= CH2 CH3( 8 ); R1= R2= CH2CH3 ( 9 )). These compounds have been characterized by different spectroscopic methods. The crystal structures of 1 ¨C 5 and 7 and 8 have been determined by X-ray crystallography. |
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alexwang0521: ½ð±Ò+10, ·ÒëEPI+1, ¡ï¡ï¡ïºÜÓаïÖú 2012-04-26 13:20:35
alexwang0521: ½ð±Ò+10, ·ÒëEPI+1, ¡ï¡ï¡ïºÜÓаïÖú 2012-04-26 13:20:35
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alexwang0521: ½ð±Ò+5, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2012-04-26 20:43:34
alexwang0521: ½ð±Ò+5, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2012-04-26 20:43:34
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