Mono and dinuclear half-sandwich platinum group metal complexes bearing pyrazolyl-pyrimidine ligands: Syntheses and structural studies
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چکیده
Reactions of 0.5 eq. of the dinuclear complexes [(g-arene)Ru(l-Cl)Cl]2 (arene = g-C6H6, g-p-PrC6H4Me) and [(Cp*)M(l-Cl)Cl]2 (M = Rh, Ir; Cp* = g-C5Me5) with 4,6-disubstituted pyrazolyl-pyrimidine ligands (L) viz. 4,6-bis(pyrazolyl)pyrimidine (L1), 4,6-bis(3-methyl-pyrazolyl)pyrimidine (L2), 4,6-bis(3,5dimethyl-pyrazolyl)pyrimidine (L3) lead to the formation of the cationic mononuclear complexes [(gC6H6)Ru(L)Cl] (L = L1, 1; L2, 2; L3, 3), [(g-p-PrC6H4Me)Ru(L)Cl] (L = L1, 4; L2, 5; L3, 6), [(Cp*)Rh(L)Cl] (L = L1, 7; L2, 8; L3, 9) and [(Cp*)Ir(L)Cl] (L = L1, 10; L2, 11; L3, 12), while reactions with 1.0 eq. of the dinuclear complexes [(g-arene)Ru(l-Cl)Cl]2 and [(Cp*)M(l-Cl)Cl]2 give rise to the dicationic dinuclear complexes [{(g-C6H6)RuCl}2(L)] (L = L1, 13; L2, 14; L3, 15), [{(g-p-PrC6H4Me)RuCl}2(L)] (L = L1, 16; L2, 17; L3, 18), [{(Cp*)RhCl}2(L)] (L = L1, 19; L2, 20; L3, 21) and [{(Cp*)IrCl}2(L)] (L = L1 22; L2, 23; L3 24). The molecular structures of [3]PF6, [6]PF6, [7]PF6 and [18](PF6)2 have been established by single crystal X-ray structure analysis.
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