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Previously studied ( 1 H NMR) mono- and dinuclear complexes obtained by reactions of [(dien)Pt(II)] with 9-methyladenine (9-MeA) have been isolated and characterized: [(dien)Pt(9-MeA- N 7 )](NO 3 ) 2 ·H 2 O ( 1 ), [(dien)Pt(9-MeA- N 1 )](NO 3 ) 2 ·H 2 O ( 2 ) and {[(dien)Pt] 2 (9-MeA- N 7 , N 1 )}(NO 3 ) 4 ·2H 2 O(3). Complex 2 , which is only the third structurally characterized adenine complex having a metal exclusively bound through N(1), crystallizes in the space group P 1 with unit cell dimensions a =8.797(2), b =10.701(3), c =12.156(3) A, α=101.93(3), β=118.18(3), γ=101.11(3)°, V =929.4 A 3 , Z =2. Trinuclear derivatives of 2 , {(NH 3 ) 2 Pt[( N 7 -9-MeA- N 1 )Pt(dien)] 2 }(NO 2 ) 6 ·6H 2 O, ( 4 ), ( 5 ) were prepared by reaction of 2 with cis - and trans -(NH 3 ) 2 Pt(II), respectively. Oxidation of 1 and 2 with H 2 O 2 gave Pt(IV) compounds of composition trans -[Pt(OH) 2 (dien)(9-MeA- N 7 )](ClO 4 ) 2 ·2H 2 O ( 6 ) and trans -[Pt(OH) 2 (dien)(9-MeA- N 1 )]X 2 · n H 2 O (X=ClO 4 − , n =2 ( 7a ); X=NO 3 − , n =0, ( 7b )). The mixed Pt(IV),Pt(II) complex trans - [(OH) 2 Pt(dien)( N 1 -9-MeA- N 7 )Pt(dien)](ClO 4 ) 4 ·2H 2 O ( 8 ) was obtained from 7 and (dien)Pt(II). The compounds prepared were characterized by elemental analysis and a variety of spectroscopic methods such at 1 H NMR, UV and Raman. Acid-base equilibria were determined for several of the compounds and the formations of heteronuclear complexes between Ag + and 1 and 2 , respectively, were followed by 1 H NMR. |
