Determination of Absolute Signs of 119S n - 117Sn Spin-Spin Coupling Constants
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چکیده
If for a given system two-dimensional (2D ) 119S n /!H heteronuclear shift correlations can be established for long range coupling constants "./(119Sn,'H ) (n = 4, 6), absolute signs of coupling constants /(Sn,Sn) are accessible by this technique for the first time. This has been demonstrated for tetrakis(trimethylstannyl)allene (1) with 2/ ( U9Sn, 117Sn) (>0) and 4/ ( n9Sn, 117Sn) (<0), and for tris(trimethylstannyl)phosphane (2) and bis(trimethylstannyl)sulfane (3) with 2/ ( 119Sn,117Sn) (<0).
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تاریخ انتشار 2013