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Controlled Modification of Triaminoguanidine-Based μ3 Ligands in Multinuclear [VIVO]/[VVO2] Complexes and Their Catalytic Potential in the Synthesis of 2-Amino-3-cyano-4H-pyrans/4H-chromenes
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2024-01-20 , DOI: 10.1021/acs.inorgchem.3c03704
Mannar R Maurya 1 , Naveen Kumar 1 , Fernando Avecilla 2
Affiliation  

Reaction of tris(2-hydroxybenzylidene)-triaminoguanidinium chloride (I·HCl) and tris(5-bromo-2-hydroxybenzylidene)-triaminoguanidinium chloride (II·HCl) with [VIVO(acac)2] (1:1 molar ratio) in refluxing methanol resulted in mononuclear [VIVO] complexes, [VIVO(H2L1′)(MeOH)] (1) and [VIVO(H2L2′)(MeOH)] (2), respectively, where I and II undergo intramolecular triazole ring formation. Aerial oxidation of 1 and 2 in MeOH in the presence of Cs2CO3 gave corresponding cis-[VVO2] complexes Cs[(VO2)(H2L1′)] (3) and Cs[(VO2)(H2L2′)] (4). However, reaction of an aerially oxidized methanolic solution of [VIVO(acac)2] with I·HCl and II·HCl in the presence of Cs2CO3 (in 1:1:1 molar ratio) gave mononuclear complexes Cs[(VO2)(H3L1)] (5) and Cs[(VO2)(H3L2)] (6) without intramolecular triazole ring formation. Similar anionic trinuclear complexes Cs2[(VO2)3(L1)] (7) and Cs2[(VO2)3(L2)] (8) were isolable upon increasing the amounts of the vanadium precursor and Cs2CO3 to 3 equiv to the reaction applied for 5 and 6. Keeping the reaction mixture of 1 in MeOH under air gave [VVO(H2L1’)(OMe)] (9). Structures of 3, 7, 8, and 9 were confirmed by X-ray crystal structure study. A permanent porosity in the crystalline metal–organic framework of 7 confirmed by single-crystal X-ray investigation was further verified by the BET study. Along with a suitable reaction mechanism, these synthesized compounds were explored as effective catalysts for the synthesis of biomolecules 4H-pyran/4H-chromenes.

中文翻译:


多核[VIVO]/[VVO2]配合物中基于三氨基胍的μ3配体的受控修饰及其在2-氨基-3-氰基-4H-吡喃/4H-色烯合成中的催化潜力



三(2-羟基亚苄基)-三氨基胍氯化物 ( I ·HCl) 和三(5-溴-2-羟基亚苄基)-三氨基胍氯化物 ( II ·HCl) 与 [V IV O(acac) 2 ] (1:1 摩尔)的反应比例)在回流甲醇中产生单核 [V IV O] 配合物,[V IV O(H 2 L 1' )(MeOH)] ( 1 ) 和 [V IV O(H 2 L 2' )(MeOH)] ( 2 ),分别,其中III经历分子内三唑环形成。在 Cs 2 CO 3存在下,在 MeOH 中空气氧化12,得到相应的顺式-[V V O 2 ] 配合物 Cs[(VO 2 )(H 2 L 1' )] ( 3 ) 和 Cs[(VO 2 ) )(H 2 L 2′ )]( 4 )。然而,空气氧化的 [V IV O(acac) 2 ] 甲醇溶液与I ·HCl 和II ·HCl 在 Cs 2 CO 3存在下(摩尔比为 1:1:1)反应,得到单核配合物 Cs[ (VO 2 )(H 3 L 1 )] ( 5 ) 和 Cs[(VO 2 )(H 3 L 2 )] ( 6 ) 不形成分子内三唑环。 随着钒前驱体和 Cs 2的量的增加,类似的阴离子三核配合物 Cs 2 [(VO 2 ) 3 ( L 1 )] ( 7 ) 和 Cs 2 [(VO 2 ) 3 ( L 2 )] ( 8 ) 是可分离的CO 3至3 相当于用于56 的反应。将1的反应混合物保持在MeOH中于空气下,得到[V V O(H 2 L 1' )(OMe)]( 9 )。 3、7、89的结构通过X射线晶体结构研究得到证实。单晶 X 射线研究证实了7晶体金属有机骨架中的永久孔隙率,并通过 BET 研究得到了进一步验证。连同合适的反应机制,这些合成的化合物被探索作为合成生物分子 4 H -吡喃/4 H -色烯的有效催化剂。
更新日期:2024-01-20
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