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The following standard enthalpies of formation (kJ mol-I) of the crystalline solids were determined at 298.15 K using solution reaction calorimetry: AHr"{[Pt{(02C)2CH2}(NH2CH2CH2NH2)]} = -974 f 7; AHf"{[Pt{(02C)2CHMe}(NH2Et)2]} = -1 087 f 10; AHf"{[Pt{(02C)2CHEt}(NH3),]} = -1 080 f 3; AHrQ{[Pt(cbda-l,1)(NH3)2]} = -959 f 3, (H2cbda-Ill = cyclobutane-1,1 -dicarboxylic acid); 1 I I .2 + 0.7 a Values in square brackets are estimated. Ref. 18. AHdG &Pt-N) * 968 97 965 108 989 113 I 029 I18 988 113 964 97 968 113 975 97 996 118 859 108 D(Pt-0) 387 375 382 397 38 1 385 37 I 391 380 3 22 AH,"([Pt(pd),], c ) was measured using the high-temperature microcalorimeter and was equal t o 114.4 i 2.0 kJ mol-'; and AH,"(Hpd, enol, g) = -384.4 k 1.3 kJ m01-l.~ Values have been proposed for D(0-H, Hpd, enol) ranging from Dalton Trans., in the press.