Mononuclear Ag(I), dinuclear and polymeric Hg(II) complexes of 3-mercapto-4-methyl-4H-1,2,4-triazole: Syntheses, spectral, X-ray, photoluminescence and thermal analysis

Specificity of the Metalloregulator CueR for Monovalent Metal Ions: Possible Functional Role of a Coordinated Thiol?

“…Whether the protonated thiol coordinates cannot be concluded, as the NMR data suggest that this is not the case,whereas the UV absorption data might indicate the contrary.Asearch in the Cambridge Structural Database [9] demonstrates that Cu I and Ag I coordination by protonated thiols is rare,b ut does exist. [10][11][12] Furthermore,t he aqua ion of Ag I is ar ather weak acid, with ap K a value of about 12 (extrapolated to zero ionic strength) and of about 10 at an ionic strength above 0, [13] that is,i t decreases the pK a value of water by about 4-6 pH units. Therefore,i ts eems plausible that Ag I ,i naf ormally neutral Ag I -SSH unit, will be av ery weak acid and will lower the pK a value of the second thiol group by only af ew pH units.…”

“…A search in the Cambridge Structural Database [9] demonstrates that Cu I and Ag I coordination by protonated thiols is rare, but does exist. [10][11][12] Further, the aqua ion of Ag I is a rather weak acid, with a pKa of ~12 (extrapolated to zero ionic strength) and ~10 at an ionic strength > 0, [13] i.e. decreasing the pKa of water by ~4-6 pH units.…”

Metalloproteinek fémkötőhelyein alapuló oligopeptidek, mint potenciális toxikus fémion érzékelők

“…A protonált tiolcsoport Ag + -koordinációja ugyan nem gyakori, de van rá példa az irodalomban. 37 A {Cys-S -,Cys-SH} típusú kötésmód CueR fehérje fémkötõ centrumában is racionális lehetõség, aminek jelentõs szerepe lehet a molekula mûködési mechanizmusában. 31 …”

Dinuclear and polymeric Hg(II) complexes with 1-(2-furoyl)thiourea derivatives: Their crystal structure and related properties

“…FBFT show a blue shift of about 12 nm in contrast to the free ligand probably due to the quenching effect of the mercury(II) ion[32]. ComplexHgCl 2 -FBT show weaker emission and it is noticeable that exhibits no shift in its emission band at 425 nm.…”

“…Nevertheless, in both types of complexes, mercury(II) exhibits a tetrahedral distorted geometry [13,29,[30][31][32][33].…”