+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

The key role of -CH3 steric hindrance in bis(pyrazolyl) ligand on polyoxometalate-based compounds

The key role of -CH3 steric hindrance in bis(pyrazolyl) ligand on polyoxometalate-based compounds

Dalton Transactions 43(22): 8405-8413

Through using two kinds of bis(pyrazolyl) ligands, four polyoxometalate (POM)-based compounds were hydrothermally synthesized and structurally characterized, [Ag3(Hbhpe)2(H2O)(H2PMo12O40)]·H2O (1), [Ag(H2bdpm)2(H2PW12O40)]·4H2O (2), [Ag6(H2bdpm)6(HPW(VI)8W(V)4O40)]·2H2O (2) and [Ag4(H2bdpm)4(H2P2W18O62)]·3H2O (4) (H2bhpe = 1,2-bis(1-H-pyrazolate)ethane, H2bdpm = 1,1'-bis(3,5-dimethyl-1H-pyrazolate)methane). In compound 1, the Ag-Hbhpe subunit is a 2D layer containing large penta-membered cycles and small tri-nuclear Ag(I) clusters. The Keggin anions covalently float on the large cycles. In compound 2, the Keggin anions are fused by [Ag(H2bdpm)2](+) subunits to form a 1D chain. Compound contains hexa-membered metal-organic cycles, which are further linked by Keggin anions to build a 1D chain. Adjacent chains share the Ag(I) ions to construct a 3D framework of 3. Compound 4 exhibits a wavy double-track chain structure, with the Wells-Dawson anions covalently suspended up and down this chain. The steric hindrance of -CH3 groups in H2bdpm leads to the formation of mono-nuclear Ag(I) subunits in 2 - 4. The influence of -CH3 steric hindrance in bis(pyrazolyl) ligands on the structures of 1 - 4 is discussed. The electrochemical and photocatalytic properties of the title compounds have been studied.

Please choose payment method:

(PDF emailed within 0-6 h: $19.90)

Accession: 056392588

Download citation: RISBibTeXText

PMID: 24740267

DOI: 10.1039/c4dt00107a

Related references

Influence of the counter anion and steric hindrance of pyrazolyl and imidazolyl flexible ligands on the structure of zinc-based coordination polymers. Inorganica Chimica Acta 414: 217-225, 2014

Influence of steric hindrance of organic ligand on the structure of Keggin-based coordination polymer. Inorganic Chemistry 45(10): 4016-4023, 2006

Copper(II) complexes of tridentate pyridylmethylethylenediamines: role of ligand steric hindrance on DNA binding and cleavage. Journal of Inorganic Biochemistry 99(8): 1717-1732, 2005

Copper(II) complexes with neutral bis(pyrazolyl)methane ligands: The influence of steric hindrance on their structures and properties. Polyhedron 27(5): 1432-1446, 2008

The role of ligand steric hindrance in determining the stability of very short VV contacts. Preparation and characterization of a series of V (II) and V (III) amidinates. Inorganica Chimica Acta 244(1): 37-49, 1996

Trans-Platinum planar amine compounds with [N2O2] ligand donor sets: effects of carboxylate leaving groups and steric hindrance on chemical and biological properties. Inorganic Chemistry 45(15): 5733-5735, 2006

Two Pb(II) dicarboxylates constructed by rigid terephthalate or flexible d(+)-camphorate with different 3D motif based on cooperative effect of steric hindrance of ligand and lone pair electrons. Journal of Molecular Structure 928(1-3): 176-181, 2009

Ligand binding to multiple equivalent sites with steric hindrance. Biochimica et Biophysica Acta 675(3-4): 392-396, 1981

Steric hindrance effect of the equatorial ligand on Fe(IV)O and Ru(IV)O complexes: a density functional study. Journal of Biological Inorganic Chemistry 15(3): 351-359, 2010

Anti-adhesive property of P-selectin glycoprotein ligand-1 (PSGL-1) due to steric hindrance effect. Journal of Cellular Biochemistry 114(6): 1271-1285, 2013

The Role of Ligand Steric Bulk in New Monovalent Aluminum Compounds. Journal of Physical Chemistry. a 121(24): 4678-4687, 2017

The Therapeutic Antibody LM609 Selectively Inhibits Ligand Binding to Human α V β 3 Integrin via Steric Hindrance. Structure 25(11): 1732-1739.E5, 2017

How does the addition of steric hindrance to a typical N-heterocyclic carbene ligand affect catalytic activity in olefin metathesis?. Dalton Transactions 42(20): 7433-7439, 2013

Steric hindrance mutagenesis versus alanine scan in mapping of ligand binding sites in the tachykinin NK1 receptor. Molecular Pharmacology 53(1): 166-175, 1998

Pyrazolyl-N-heterocyclic carbene complexes of rhodium as hydrogenation catalysts: The influence of ligand steric bulk on catalyst activity. Dalton Transactions 2009(35): 7029-7038, 2009