Hole transporting compounds and compositions

A method of forming a layer of an organic electronic device comprising the step of reacting a composition comprising a first material substituted with at least one group of formula (I) and a second material substituted with at least one group selected from groups of formulae (IIa) and (IIb):

• wherein at least one of the first material and the second material is a repeat unit of a polymer;
• wherein:
• Sp1 represents a first spacer group;
• NB independently in each occurrence is a norbornene group that may be unsubstituted or substituted with one or more substituents;
• n1 is 0 or 1;
• m1 is 1 if n1 is 0 and m1 is at least 1 if n1 is 1;
• Sp2 represents a second spacer group;
• n2 is 0 or 1;
• m2 is 1 if n2 is 0 and m2 is at least 1 if n2 is 1;
• Ar1 independently in each occurrence represents an aryl or heteroaryl group that may be unsubstituted or substituted with one or more substituents;
• R1 independently in each occurrence is H or a substituent;
• and
• * represents a point of attachment to the first or second material.

A composition comprising a first material substituted with at least one group of formula (I) and a second material substituted with at least one group selected from groups of formulae (IIa) and (IIb):

• wherein:
• Sp1 represents a first spacer group;
• NB independently in each occurrence is a norbornene group that may be unsubstituted or substituted with one or more substituents;
• n1 is 0 or 1;
• m1 is 1 if n1 is 0 and m1 is at least 1 if n1 is 1;
• Sp2 represents a second spacer group;
• n2 is 0 or 1;
• m2 is 1 if n2 is 0 and m2 is at least 1 if n2 is 1;
• Ar1 independently in each occurrence represents an aryl or heteroaryl group that may be unsubstituted or substituted with one or more substituents;
• R1 independently in each occurrence is H or a substituent, wherein at least one R1 is not H;
• and
• * represents a point of attachment to the first or second material.