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Pt 4 S 4 Clusters with Functionalized Thiosemicarbazones derived from 5‐Acetylbarbituric Acid
Author(s) -
Bermejo Elena,
Castiñeiras Alfonso,
GarcíaSantos Isabel,
GómezRodriguez Lourdes,
Sevillano Paloma
Publication year - 2007
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200700151
Subject(s) - semicarbazone , chemistry , substituent , platinum , metal , ligand (biochemistry) , stacking , nitrogen atom , stereochemistry , intermolecular force , atom (system on chip) , amine gas treating , cluster (spacecraft) , sulfur , nitrogen , crystallography , medicinal chemistry , molecule , ring (chemistry) , catalysis , organic chemistry , biochemistry , receptor , computer science , programming language , embedded system
Reaction of K 2 [PtCl 4 ] with thiosemicarbazones derived from 5‐acetylbarbituric acid led to the isolation of the tetranuclear species [Pt(AcbM)] 4 · 2/2DMSO · 2DMSO · 5H 2 O ( 1 ) and [Pt(AcbE)] 4 · 4DMSO · 2H 2 O ( 2 ) (H 2 AcbM = 5‐acetylbarbituric‐4N‐methyl thiosemicarbazone and H 2 AcbE = 5‐acetylbarbituric‐4N‐ethyl thiosemicarbazone). Both of these compounds feature a Pt 4 S 4 cluster in which some of the Pt–Pt distances suggest the existence of weak metal‐metal interactions. Crystals of these tetranuclear species are stabilized by intermolecular π‐π stacking interactions. The two compounds have almost equivalent molecular structures, differing only in the orientation of the substituent on the amine nitrogen atom of the thiosemicarbazone. The two tetranuclear complexes contain the thiosemicarbazone bonded as a terdentate ligand to the platinum atom through the thiolate sulfur atom, the azomethine nitrogen atom and the alcoholate oxygen atom of the 5‐acetylbarbiturate function.