Binuclear palladium(II) complexes of the trianionic binucleating llgand (L'-), formally derived from 2-mercapto-5-methylisophthalaklehyde di-2'-hydroxyanil by loss of one mercapto and two phenolic protons, appear to present a sipnificantly larger exchangeable bridging site than earlier binucleating systems contaking a bridging phenoxide component. Thus LPS is found to incorpomte at this site a mnge of 'three atom bridges'as in, for example, Pd-OZC-(CH&S-Pd, Pd-NH%%'(C&s):*3H-Pd and Pd-P(CeH&-CH~P(CeH,)2--Pd and apparently some related H-bonded three atom bridges as in, for example, Pd-O(H)***H-9 l N(H)(RkPd. In one case, Na [LPdJNO,),] 2H,O, it appears that two independent nitrite groups are bound at the normally bridging site (i.e. a 'non-bridged' system). However, LPdz will also incorpomte 'two atom bridges', e.g. pyrazolate anion, neutral pyridazine, and a single nitrite ion bridging via N and 0. Even 'one atom bridges
' can be accommodated provided they are large enough, e.g. r, Br-, but the corresponding chloro-bridged complex, LPd&7, could not be obtained.