Siloxane functionalized platinum oxalate complex

A platinum(II) oxalate compound of the following formula:

• where R1 is phenyl(CH2)nR4, where n is from 3 to 30;
• each R2 is independently C1-C10-alkyl, phenyl, or phenyl(CH2)nR4;
• each R3 is independently C1-C10-alkyl, phenyl, phenyl(CH2)nR4, or each R3, together with the phosphorus atoms to which they are attached, form a diphosphine;
• each R4 is either:
• where R5 is C1-C10-alkyl or phenyl;
• R6 is C1-C10-alkyl or phenyl or O—Si(CH3)3;
• each R7 is independently C1-C10 alkyl or phenyl;
• R7′ is C1-C10 alkyl;
• and each R8 is independently C1-C10-alkyl or phenyl;
• x is from 2 to 250;
• and the dotted line represents the point of attachment to a CH2 radical.