‘Inverse crown ether’ complexes: extension to potassium through the synthesis of [{[(Me3Si)2N]4K2Mg2(O2)}∞], a peroxo-centred macrocycle linked into infinite chains by intermolecular K⋯CH3(SiMe2) interactions

‘Inverse crown ether’ complexes: extension to potassium through the synthesis of [{[(Me3Si)2N]4K2Mg2(O2)}∞], a peroxo-centred macrocycle linked into infinite chains by intermolecular K⋯CH3(SiMe2) interactions