3 years ago

Flexibility and Stability of Metal Coordination Macromolecules

Flexibility and Stability of Metal Coordination Macromolecules
Diya Geng, Dapeng Liu, Heyan Jiang, Nicholas Lanigan, Xiaosong Wang
The effect of chain structure on flexibility and stability of macromolecules containing weak P−Fe metal coordination bonds is studied. Migration insertion polymerization (MIP) of FpCXFp (1) and PR2CYPR2 (2) (Fp: CpFe(CO)2; CX and CY: alkyl spacers; P: phosphine; R: phenyl or isopropyl) generates P(1/2), in which the P−Fe and Fe−P bonds with opposite bonding direction are alternatively arranged in the backbone. On the other hand, P(FpCXP) synthesized from AB-type monomers (FpCXP) has P−Fe bonds arranged in the same direction. P(1/2) is more rigid and stable than P(FpCXP), which is attributed to the chain conformation resulting from the P−Fe bonding direction. In addition, the longer spacers render P(1/2) relatively flexible; the phenyl substituents, as compared with the isopropyl groups, improves the rigidity, thermal, and solution stability of P(1/2). It is therefore possible to incorporate weak metal coordination bonds into macromolecules with improved stability and adjustable flexibility for material processing. Nylon-like: Weak metal coordination bonds can be connected into macromolecules with varied flexibility, higher thermal and solution stability.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201701133

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