52241-27-7Relevant articles and documents
Discrete Molecular Squares {[(en)M(CN)]4}4+ Derived from [(en)M(CN)2] (M = PtII, PdII)
Galstyan, Anzhela,Sanz Miguel, Pablo J.,Wolf, Jacqueline,Freisinger, Eva,Lippert, Bernhard
, p. 1649 - 1656 (2011)
C2h-symmetrical tetranuclear metallacycles {[M(en)(CN)] 4}(NO3)4 with M = PdII (4) and PtII (5) have been prepared upon reacting M(en)(CN)2 [M = PdII (1), PtII (2)] with [M(en)(H2O) 2](NO3)2. Replacement of the nitrate anions of 5 by terephthalate anions yields the corresponding salt 5a. The X-ray crystal structures of 1, 4, 5, and 5a have been determined. In the metallacycles 4, 5, and 5a the four metals form almost ideal squares with average M···M distances of ca. 5.05 A? (5, 5a) and 5.08 A? (4) along the sides. As shown by 1H NMR spectroscopy, the Pt square 5 is stable in aqueous solution, whereas the Pd square 4 undergoes rearrangement reactions upon aging or the presence of other Pd species such as (bpy)PdII. Preliminary studies on the possibility of non-covalent interactions of 4 and 5 with model nucleobases in water reveal that only 5 is useful in this respect. According to the concentration-dependence 1H NMR study, there is an interaction with the purine base 9-ethyladenine, molecular details of which are unclear at this stage, however. Compound 4 is substitutionally labile and is transformed into the coordination compound 8 with 1-methylcytosine. Two more side products, produced during the various reactions carried out, were characterized by X-ray crystallography: [Pt(en) 2][Pt(CN)4] (3) and [Pd(bpy)(en)](SO4) ·3H2O (7). Cationic molecular squares composed of (en)M (M = PtII, PdII) corners and cyanide bridges have been prepared and details of their formation and reactivity have been studied. Copyright
Interaction of (amine)M(II) complexes (amine=dien, en; M=Pd, Pt) with purine nucleoside 2′-, 3′- and 5′-monophosphates - The role of the phosphate site for specific metal fragment-nucleotide recognition by macrochelation
Wirth,Blotevogel-Baltronat,Kleinkes,Sheldrick
, p. 14 - 26 (2002)
The pH-dependent interaction of [Pd(dien)(H2O)]2+ with adenosine and guanosine 2′- and 3′-monophosphates at molar ratios R=1 and 3 has been studied by potentiometric and NMR techniques. The absence of additional intramolecular stabilisation of the N7 coordination mode by (amine)N-H?O(phosphate) hydrogen bonding, as for 5′-AMP2- or 5′-GMP3-, leads to reversal of the intrinsic binding ratio log[β(BM1)/β(M7B)] in favour of N1 coordination for mononuclear (dien)Pd(II) complexes of the purine 2′- and 3′-nucleotides. Outer-sphere κ2N7,O(phosphate) macrochelation is also responsible for the formation of a specific μ-N1,N7 bridged cyclic tetramer [{(en)Pd(5′-GMP)}4]4- in the pH range 5.5-9.5. Both inner- and outer-sphere κ2N3,O(phosphate) macrochelation lead at R=3 to a dramatic enhancement of (en)Pd(II) binding to N3 of 2′-GMP3- in comparison to 3′- or 5′-GMP3-. Reaction of [{Pt(dien)}2(2′-GMP-μ-N1,N7)]+ with [Pt(en)(H2O)2]2+ affords both types of macrochelate at approximately 1:1 ratio, namely [{Pt(dien)}2(2′-GMP-μ3-N1,N3,N7,O(P)){Pt(en)} 3+ and [{Pt(dien)}2(2′-GMP-μ3-N1,N3,N7) {Pt(en)H2O)}]3+ with respectively direct (en)Pt-O(phosphate) and outer-sphere (amine)N-H?O(phosphate) hydrogen bonding. Following HPLC separation, these trinuclear products could be characterised by NMR and FAB-MS.
Dimethyl sulfoxide as a ligand in binuclear platinum(II) complexes
Salishcheva,Gel'fman
, p. 51 - 53 (2008/10/09)
Binuclear platinum(II) complexes in which dimethyl sulfoxide molecules function as terminal and bridging ligands were prepared by a reaction between platinum(II) diamine compounds.
Nonelectrolytic bromide-bridged binuclear platinum(II) complexes
Salishcheva,Moldagulova,Gel'fman
, p. 1528 - 1530 (2008/10/09)
Nonelectrolytic binuclear platinum(II) complexes and mixed-valence compounds in which bromine atoms coordinated to two platinum atoms were prepared by the interaction of cis-diaqua-diammineplatinum(II) with K 2[PtBr4] and K2[PtBr6].
