Two Gd_(2)complexes,namely[Gd_(2)(dbm)_(2)(HL_(1))_(2)(CH_(3)OH)_(2)]·4CH_(3)OH(1)and[Gd_(2)(dbm)_(2)(L_(2))_(2)(CH_(3)OH)_(2)]·2CH_(3)OH(2),where H_(3)L_(1)=(Z)-N'-[4-(diethylamino)-2-hydroxybenzylidene...Two Gd_(2)complexes,namely[Gd_(2)(dbm)_(2)(HL_(1))_(2)(CH_(3)OH)_(2)]·4CH_(3)OH(1)and[Gd_(2)(dbm)_(2)(L_(2))_(2)(CH_(3)OH)_(2)]·2CH_(3)OH(2),where H_(3)L_(1)=(Z)-N'-[4-(diethylamino)-2-hydroxybenzylidene]-2-hydroxyacetohydrazide,H_(2)L_(2)=(E)-N'-(5-bromo-2-hydroxy-3-methoxybenzylidene)nicotinohydrazide,Hdbm=dibenzoylmethane,have been constructed by adopting the solvothermal method.Structural characterization unveils that both complexes 1 and 2 are constituted by two Gd^(3+)ions,two dbm-ions,two CH_(3)OH molecules,and two polydentate Schiff-base ligands(HL_(1)^(2-)or L_(2)^(2-)).In addition,complex 1 contains four free methanol molecules,whereas complex 2 harbors two free methanol molecules.By investigating the interactions between complexes 1 and 2 and four types of bacteria(Bacillus subtilis,Escherichia coli,Staphylococcus aureus,Candida albicans),it was found that both complexes 1 and 2 exhibited potent antibacte-rial activities.The interaction mechanisms between the ligands H_(3)L_(1),H_(2)L_(2),complexes 1 and 2,and calf thymus DNA(CT-DNA)were studied using ultraviolet-visible spectroscopy,fluorescence titration,and cyclic voltammetry.The results demonstrated that both complexes 1 and 2 can intercalate into CT-DNA molecules,thereby inhibiting bacterial proliferation to achieve the antibacterial effects.CCDC:2401116,1;2401117,2.展开更多
Five multinuclear cyclotriphosphazene ligands were synthesized and tested for their cleavage activities to plasmid DNA. All of these new compounds were confirmed by MS, ^1H NMR, ^31P NMR, ^13C NMR and IR. Preliminary ...Five multinuclear cyclotriphosphazene ligands were synthesized and tested for their cleavage activities to plasmid DNA. All of these new compounds were confirmed by MS, ^1H NMR, ^31P NMR, ^13C NMR and IR. Preliminary studies on the cleavage of pUC19 DNA in the presence of metal complexes were performed. The results revealed that these complexes could act as powerful catalysts under physiological conditions. The complexes 3b ＋ Cu can effectively cleave DNA to nicked form, giving hydrolysis rate constant of 0.08/h under physiological conditions. An acid-base catalyzed DNA phosphate-diester hydrolysis mechanism was also orooosed.展开更多
Two central hydroxyl group containing Schiff base type ligands L1 and L2 as well as their metal complexes L12CuCl23H2O and L2Zn2Cl2C2H5OH were synthesized and characterized. The crystal and molecular structures of L2...Two central hydroxyl group containing Schiff base type ligands L1 and L2 as well as their metal complexes L12CuCl23H2O and L2Zn2Cl2C2H5OH were synthesized and characterized. The crystal and molecular structures of L2 and its zinc complex indicated well the means of coordination behavior. Both the two ligands showed good ion transport ability for alkali, alkaline earth and transition metal ions.展开更多
The synthesis and characterization are reported for a series of bi- and trinuclear complexes of the first transition metal ions with PBDETA, the newly syn thesized polydentate ligand. The electron transition energy in...The synthesis and characterization are reported for a series of bi- and trinuclear complexes of the first transition metal ions with PBDETA, the newly syn thesized polydentate ligand. The electron transition energy in binuclear compound is stronger than that in trinuclear. There is a weak antiferromagnetic exchange interaction in tricopper and trimanganese.展开更多
The formation of metal–carbon(M–C)bonds represents a fundamental process in organometallic chemistry.A central question arises:what is the maximum number of M–C bonds that can be formed on a single metal center?Ove...The formation of metal–carbon(M–C)bonds represents a fundamental process in organometallic chemistry.A central question arises:what is the maximum number of M–C bonds that can be formed on a single metal center?Over the past decade,Xia and co-workers have been dedicated to addressing this challenge.They developed a strategy based on chelating metal centers with conjugated carbon chains,which allows for the formation of multiple M–C bonds whose number increases with the length of the carbon chain.A landmark achievement came in 2013 with the first synthesis of metallapentalynes,a new class of metal-bridged fused-ring metallacycles with planar Craig aromaticity.These complexes are formally constructed by chelating a metal center with a seven-atom conjugated carbon ligand via three M–Cσbonds.This breakthrough established a new research area termed“carbolong chemistry”,which focuses on the interactions between transition metals and conjugated carbon ligands.Since then,the Xia group has synthesized a diverse family of carbon-based polydentate chelates involving three to five coplanar M–Cσbonds,including the first metal-centered[15]annulene,collectively known as“carbolong complexes”.Moreover,carbolong motifs have been successfully incorporated into polymer backbones,yielding a new class of materials with numerous M–C bonds,referred to as“polycarbolongs”.Both carbolong complexes and polycarbolongs exhibit not only unique structures but also remarkable properties,showing considerable potential in applications such as catalysis,biomedicine,luminescent materials,and photovoltaics.This review summarizes recent advances in the synthesis and applications of carbolong complexes and polycarbolongs.展开更多
Under self-assembly,a novel polydentate benzimidazole ligand 2-(quinoline-2-yl)-benzimidazole(2-QLBM)and two In(III)compounds,[In(2-Hqlca)_(2)Cl_(3)·3H_(2)O](1)and{[In(2-QLBM)(2-qlca)Cl_(2)]_(2)·CH_(3)CN...Under self-assembly,a novel polydentate benzimidazole ligand 2-(quinoline-2-yl)-benzimidazole(2-QLBM)and two In(III)compounds,[In(2-Hqlca)_(2)Cl_(3)·3H_(2)O](1)and{[In(2-QLBM)(2-qlca)Cl_(2)]_(2)·CH_(3)CN·2H_(2)O}(2)(2-Hqlca=2-quinolinecarboxylic acid)have been synthesized and characterized.Both the In(III)compounds are driven by noncovalent interactions to assemble into supramolecular metal–organic frameworks(MOFs).展开更多
n-Hexadecanoic acid (HA) and α-hydroxyl n-hexadecanoic add (HHA) are shown to spontaneously assemble on Si-supported titanium surfaces. Contact angle measurements, reflection absorbance IR, AFM and XPS characterizati...n-Hexadecanoic acid (HA) and α-hydroxyl n-hexadecanoic add (HHA) are shown to spontaneously assemble on Si-supported titanium surfaces. Contact angle measurements, reflection absorbance IR, AFM and XPS characterizations are performed to examine the physical and chemical states of attached monolayers. The results show that the two amphiphiles tend to form disordered monolayers on titanium surfaces. The HHA headgroups are believed to form polydentate coordination with Ti, which is more chemically stable than the bidentate coordination of HA. All the facts of characterization indicate that HHA monolayer has more surface coverage than HA monolayer.展开更多
文摘Two Gd_(2)complexes,namely[Gd_(2)(dbm)_(2)(HL_(1))_(2)(CH_(3)OH)_(2)]·4CH_(3)OH(1)and[Gd_(2)(dbm)_(2)(L_(2))_(2)(CH_(3)OH)_(2)]·2CH_(3)OH(2),where H_(3)L_(1)=(Z)-N'-[4-(diethylamino)-2-hydroxybenzylidene]-2-hydroxyacetohydrazide,H_(2)L_(2)=(E)-N'-(5-bromo-2-hydroxy-3-methoxybenzylidene)nicotinohydrazide,Hdbm=dibenzoylmethane,have been constructed by adopting the solvothermal method.Structural characterization unveils that both complexes 1 and 2 are constituted by two Gd^(3+)ions,two dbm-ions,two CH_(3)OH molecules,and two polydentate Schiff-base ligands(HL_(1)^(2-)or L_(2)^(2-)).In addition,complex 1 contains four free methanol molecules,whereas complex 2 harbors two free methanol molecules.By investigating the interactions between complexes 1 and 2 and four types of bacteria(Bacillus subtilis,Escherichia coli,Staphylococcus aureus,Candida albicans),it was found that both complexes 1 and 2 exhibited potent antibacte-rial activities.The interaction mechanisms between the ligands H_(3)L_(1),H_(2)L_(2),complexes 1 and 2,and calf thymus DNA(CT-DNA)were studied using ultraviolet-visible spectroscopy,fluorescence titration,and cyclic voltammetry.The results demonstrated that both complexes 1 and 2 can intercalate into CT-DNA molecules,thereby inhibiting bacterial proliferation to achieve the antibacterial effects.CCDC:2401116,1;2401117,2.
基金supports from the NNSFC(Nos.20602032,20732004 and 20572061).
文摘Five multinuclear cyclotriphosphazene ligands were synthesized and tested for their cleavage activities to plasmid DNA. All of these new compounds were confirmed by MS, ^1H NMR, ^31P NMR, ^13C NMR and IR. Preliminary studies on the cleavage of pUC19 DNA in the presence of metal complexes were performed. The results revealed that these complexes could act as powerful catalysts under physiological conditions. The complexes 3b ＋ Cu can effectively cleave DNA to nicked form, giving hydrolysis rate constant of 0.08/h under physiological conditions. An acid-base catalyzed DNA phosphate-diester hydrolysis mechanism was also orooosed.
文摘Two central hydroxyl group containing Schiff base type ligands L1 and L2 as well as their metal complexes L12CuCl23H2O and L2Zn2Cl2C2H5OH were synthesized and characterized. The crystal and molecular structures of L2 and its zinc complex indicated well the means of coordination behavior. Both the two ligands showed good ion transport ability for alkali, alkaline earth and transition metal ions.
文摘The synthesis and characterization are reported for a series of bi- and trinuclear complexes of the first transition metal ions with PBDETA, the newly syn thesized polydentate ligand. The electron transition energy in binuclear compound is stronger than that in trinuclear. There is a weak antiferromagnetic exchange interaction in tricopper and trimanganese.
基金financial support by the University of Science and Technology of China(KY2060000264).
文摘The formation of metal–carbon(M–C)bonds represents a fundamental process in organometallic chemistry.A central question arises:what is the maximum number of M–C bonds that can be formed on a single metal center?Over the past decade,Xia and co-workers have been dedicated to addressing this challenge.They developed a strategy based on chelating metal centers with conjugated carbon chains,which allows for the formation of multiple M–C bonds whose number increases with the length of the carbon chain.A landmark achievement came in 2013 with the first synthesis of metallapentalynes,a new class of metal-bridged fused-ring metallacycles with planar Craig aromaticity.These complexes are formally constructed by chelating a metal center with a seven-atom conjugated carbon ligand via three M–Cσbonds.This breakthrough established a new research area termed“carbolong chemistry”,which focuses on the interactions between transition metals and conjugated carbon ligands.Since then,the Xia group has synthesized a diverse family of carbon-based polydentate chelates involving three to five coplanar M–Cσbonds,including the first metal-centered[15]annulene,collectively known as“carbolong complexes”.Moreover,carbolong motifs have been successfully incorporated into polymer backbones,yielding a new class of materials with numerous M–C bonds,referred to as“polycarbolongs”.Both carbolong complexes and polycarbolongs exhibit not only unique structures but also remarkable properties,showing considerable potential in applications such as catalysis,biomedicine,luminescent materials,and photovoltaics.This review summarizes recent advances in the synthesis and applications of carbolong complexes and polycarbolongs.
基金supported by the National Natural Science Foundation of China(Grant 21371040 and 21571042)the National Key Basic Research Program of China(973 Program,No.2013CB632900).
文摘Under self-assembly,a novel polydentate benzimidazole ligand 2-(quinoline-2-yl)-benzimidazole(2-QLBM)and two In(III)compounds,[In(2-Hqlca)_(2)Cl_(3)·3H_(2)O](1)and{[In(2-QLBM)(2-qlca)Cl_(2)]_(2)·CH_(3)CN·2H_(2)O}(2)(2-Hqlca=2-quinolinecarboxylic acid)have been synthesized and characterized.Both the In(III)compounds are driven by noncovalent interactions to assemble into supramolecular metal–organic frameworks(MOFs).
文摘n-Hexadecanoic acid (HA) and α-hydroxyl n-hexadecanoic add (HHA) are shown to spontaneously assemble on Si-supported titanium surfaces. Contact angle measurements, reflection absorbance IR, AFM and XPS characterizations are performed to examine the physical and chemical states of attached monolayers. The results show that the two amphiphiles tend to form disordered monolayers on titanium surfaces. The HHA headgroups are believed to form polydentate coordination with Ti, which is more chemically stable than the bidentate coordination of HA. All the facts of characterization indicate that HHA monolayer has more surface coverage than HA monolayer.
