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We use observations of chlorine-bearing species in molecular absorbers atintermediate redshifts to investigate chemical properties and$^{35}$Cl/$^{37}$Cl isotopic ratios in the absorbing sightlines. Chloronium(H$_2$Cl$^+$) is detected along three independent lines of sight in the z=0.89and z=0.68 molecular absorbers located in front of the lensed quasars PKS1830-211 and B 0218+357, respectively. Hydrogen chloride (HCl) was observedonly toward PKS 1830-211, and is found to behave differently from H$_2$Cl$^+$.It is detected in one line of sight with an abundance ratio [H$_2$Cl$^+$]/[HCl]$\sim 1$, but remains undetected in the other, more diffuse, line of sight,with a ratio [H$_2$Cl$^+$]/[HCl]~$>17$. The absorption profiles of these twochlorine-bearing species are compared to other species and discussed in termsof the physical properties of the absorbing gas. Our findings are consistentwith the picture emerging from chemical models where different species tracegas with different molecular hydrogen fraction. The $^{35}$Cl/$^{37}$Clisotopic ratios are measured in the different lines of sight and are discussedin terms of stellar nucleosynthesis.

Chlorine-bearing molecules in molecular absorbers at intermediate redshifts