Synthesis of Exceptionally Stable Iron and Ruthenium eta(1)-tetrahedro-Tetraphosphorus Complexes: Evidence for a Strong Temperature Dependence of M-P(4) pi Back Donation This work was supported by INTAS (project 00-00018) and by the EC through COSTD17 Action (WGD17/003) and the RTN program (contract HPRM-CT-2000-0010). I. de los Ríos thanks "Ministerio de Ciencia y Tecnologia" (Spain) for a postdoctoral grant.
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Isaac
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