Polymerization of CuCl and CuBr

CuCl and CuBr are transition metal halides that exist as polymers rather than monomers or dimers. The polymerization of CuCl and CuBr occurs due to the bridging of halogen atoms.

Polymerization of CuCl

In the case of CuCl, the bridging occurs through the formation of bridging chlorine atoms. Each Cu atom is bonded to two Cl atoms, with one Cl atom bridging the two Cu atoms. The resulting polymer is a one-dimensional chain.

Polymerization of CuBr

Similarly, CuBr also undergoes polymerization through the bridging of bromine atoms. Each Cu atom is bonded to two Br atoms, with one Br atom bridging the two Cu atoms. The resulting polymer is also a one-dimensional chain.

Comparison with other transition metal halides

In comparison to other transition metal halides, CuCl and CuBr have a lower tendency to form dimers or trimers. For example, FeCl3 exists as a dimer, while FeCl2 exists as a monomer. Similarly, TiCl4 exists as a polymer, but its structure is different from that of CuCl and CuBr.

Conclusion

In conclusion, CuCl and CuBr exist as polymers due to the bridging of halogen atoms. The resulting polymers are one-dimensional chains. This is in contrast to other transition metal halides, which may exist as monomers, dimers, trimers, or polymers with different structures.