Syntheses, Crystal Structures, and Magnetic Properties of MnIII(L)phosphinate Complexes (L = meso‐tetraphenylporphyrin or Schiff base)

Abstract

AbstractThe structural organization and magnetic properties of MnIII complexes with meso‐tetraphenylporphyrin (TPP), bis(3,5‐di‐tert‐butylsalicylidene)ethylenediamine (tBuSalen), and bis(salicylidene)ethylenediamine (Salen) capping ligands assembled with phosphinate ligands such as H2PO2–, PhHPO2– and Ph2PO2– have been investigated. The structural organization and, thus, the magnetic properties in this series depends on the nature of both the capping and bridging ligands. The hypophosphite ion (H2PO2–) and the diphenylphosphinate ion (Ph2PO2–) act as bridging ligands to form 1D polymeric structures [{Mn(TPP)O2PH2}2·H2O·EtOH]n and [Mn(Salen)O2PPh2]n, among which only the former presents single chain magnet behaviour; the pronounced nonalignment of the anisotropy axes explains the absence of such behaviour in the latter. The phenylphosphinate ion (PhHPO2–) and the diphenylphosphinate ion (Ph2PO2–) act as monodentate ligands in the complexes with tBuSalen and TPP as capping ligands, respectively. The diphenylphosphinate ion acts as both a bidentate ligand and charge‐compensating anion in [Mn2(tBuSalen)2(O2PPh2)(EtOH)2+(Ph2PO2–)·H2O].