A series of o-phenylenediamine bridged tris(phenolate) ligand-stabilized rare-earth metal complexes were synthesized and characterized. Lanthanum (complex 1), neodymium (complex 2^tBu), and yttrium (complex 3) complexes stabilized by ligand of bulky tert-butyl substituents are mononuclear, whereas neodymium complexes 2^Me and 2^Cl bearing smaller methyl and chloro substituents are dinuclear, respectively. They were applied in the alternating copolymerization of CO₂ and cyclohexene oxide. The addition of benzyl alcohol is beneficial to improving yields (up to 86%) and selectivity of poly(carbonate) (up to 99%). Stoichiometric reaction of benzyl alcohol with rare-earth metal complexes 1 and 2^tBu results in formation of complexes 4 and 5 as dinuclear complexes with benzyl alcohol coordination, which was confirmed via single crystal X-ray diffraction analysis, and nuclear magnetic resonance (NMR) spectroscopy (for 4). Complex 5 shows equally good activity and selectivity of that of complex 2^tBu and benzyl alcohol, consolidating that complex 5 is indeed generated during polymerization. The neodymium tris(phenolate) 5 is one of the few examples of rare-earth metal complex as a single-component initiator for copolymerization of epoxide and CO₂. Matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry analysis proves benzyloxy group as the chain end. ¹H NMR monitoring suggests that the insertion of CO₂ may be the first step in the growth of the polymer chain.

合成并表征了一系列邻苯二胺桥联三(酚)配体稳定的稀土金属配合物。镧（络合物1）、钕（络合物2 ^{t Bu}）和钇（络合物3）络合物由大叔丁基取代基的配体稳定是单核的，而带有较小甲基和氯取代基的钕络合物2 ^Me和2 ^Cl是双核的，分别。应用于CO _{2的交替共聚}和环己烯氧化物。添加苯甲醇有利于提高聚碳酸酯的收率（高达 86%）和选择性（高达 99%）。苄醇与稀土金属配合物1和2 ^{t Bu}的化学计量反应导致配合物4和5与苄醇配位形成双核配合物，这通过单晶 X 射线衍射分析和核磁共振 (NMR) 得到证实) 光谱学（对于4）。络合物5表现出与络合物2 ^{t Bu}和苯甲醇同样好的活性和选择性，巩固了络合物5确实是在聚合过程中产生的。三(酚)钕5是稀土金属络合物作为单组分引发剂用于环氧化物和CO ₂共聚的少数例子之一。基质辅助激光解吸电离飞行时间（MALDI-TOF）质谱分析证明苄氧基为链端。¹ H NMR 监测表明，CO ₂的插入可能是聚合物链增长的第一步。