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Cation-π induced aggregation of water-soluble [Pt(II)(diimine)(L(n)-S,O)](+) complexes studied by (1)H DOSY NMR and TEM: from 'dimer aggregates' in acetonitrile to nano-aggregates ('metallogels') in water.
MedLine Citation:
PMID:  23212303     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
(1)H NMR chemical shift concentration dependence as well as the diffusion coefficients from DOSY NMR of mixed ligand [Pt(II)(1,10-phenanthroline)(N-pyrrolidyl-N-(2,2-dimethylpropanoyl)thiourea)]Cl ([Pt(II)(phen)(L(1)-S,O)]Cl) dissolved in mixtures of acetonitrile-water in the range 0-30% (v/v) D(2)O-CD(3)CN shows that the complex cation (M(+) = [Pt(II)(phen)(L(1)-S,O)](+)) aggregates to form dimers, 2M(+) ⇌ {M(+)}(2), with association constants ranging from K(D)(CD(3)CN) = 17 ± 2 M(-1) to K(D)(30% (v/v) D(2)O-CD(3)CN) = 71 ± 8 M(-1) at 299.3 K, presumably via non-covalent cation-π interactions. Experimental data are consistent with an 'offset' face-to-face cation-π stacking arrangement of the planar cation. However in water-rich solvent mixtures from >30% (v/v) D(2)O-CD(3)CN to pure D(2)O, the extent of aggregation significantly increases until a critical aggregation concentration (CAC) is reached, estimated to be 9.6 and 10.3 mM from (1)H NMR chemical shift concentration dependence and DOSY NMR measurements respectively. Above the CAC the formation of nano-structures formulated as {[Pt(II)(phen)(L(1)-S,O)](+)}(n)Cl(-)(y) (n, y > 2) is indicated. DOSY studies show a significant decrease of the average diffusion coefficient D(obs) as a function of increasing concentration of [Pt(II)(phen)(L(1)-S,O)]Cl in D(2)O. The aggregation number (N) estimated from hydrodynamic volumes of the mononuclear [Pt(II)(phen)(L(1)-S,O)](+) cation (V), and those V(H) estimated from D(obs) (N = V(H)/V) as a function of total complex concentration, ranges from ∼2 to ∼735 in pure D(2)O. Above the CAC well defined nano-structures which may be loosely termed "metallogels" could be characterized by means of transmission electron microscopy. As expected the addition of NaCl appears to increase the extent of aggregate formation, by presumably stabilizing the formation of nano-sized {[Pt(II)(phen)(L(1)-S,O)](+)}(n)Cl(-)(y) aggregates preventing excessive positive electrostatic charge build-up.
Authors:
Izak A Kotzé; Wilhelmus J Gerber; Yu-Shan Wu; Klaus R Koch
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-5
Journal Detail:
Title:  Dalton transactions (Cambridge, England : 2003)     Volume:  -     ISSN:  1477-9234     ISO Abbreviation:  Dalton Trans     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101176026     Medline TA:  Dalton Trans     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Platinum Metals Chemistry Research Group, Department of Chemistry and Polymer Science, University of Stellenbosch, P Bag X1, Matieland, 7602, South Africa. krk@sun.ac.za.
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