**2.3 Axially RPy-bonded tricationic P-porphyrins: (RPy5)2P(Tpp)3+**

Bis[5-(3-alkyl-1-pyridinio)-3-oxapentyloxo]tetraphenylporphyrinatophosphorus(V) dibromide, chloride ((RPy5)2P(Tpp)3+) was prepared from dihydroxo(tetraphenylporphyrinato)phosphorus chloride ([(HO)2P(Tpp)]Cl), which was prepared by hydrolysis of [Cl2P(Tpp)]Cl (300 mg) by refluxing in a mixed solvent of MeCN (160 mL) with pyridine (60 mL) and H2O (60 mL) [22]. Alkylation of [(HO)2P(Tpp)]Cl (80 mg) with di(2-bromoethyl) ether (1 mL) was performed in the presence of K2CO3 (19 mg) and 18-crown-6 ether (4.2 mg) in MeCN (5 mL) at 50°C to give bis(5-bromo-3-oxa-pentyloxo)tetraphenylporphyrinatophosphorus(V) chloride ((Br5)2P(Tpp)+ ). The (Br5)2P(Tpp)+ (50 mg) was reacted with 3-alkylpyridine (1.0 mL) in MeCN (10 mL) under heating at 100°C for 20–68 h for the preparations of (RPy5)2P(Tpp)3+ [22]. Similarly, bis[5-(4-ethyl-1-pyridinio)-3-oxapentyloxo]tetraphenylporphyrinatophosphor us(V) dibromide, chloride, (4EtPy5)2P(Tpp)3+ was prepared via the reaction of (Br5)2P(Tpp)+ (63 mg) with 4-ethylpyridine (1.0 mL) in dry MeCN (10 mL) at 100°C for 20 h.
