The monoammoniate of silver monochloride, H3N center dot center dot center dot Ag-Cl, has been synthesised by laser ablation of metallic silver in the presence of a dilute mixture of NH3 and CCl4 in argon. The rotational spectra of five symmetric-top isotopologues were observed using a pulsed-jet, F-T microwave spectrometer that incorporates a laser-ablation source. Rotational constants B-0, centrifugal distortion constants D-J and D-JK, and Cl and N-14 nuclear hyperfine coupling constants were determined. r(0) and r(s) values of the N-Ag and Ag-Cl internuclear distances are reported and compared with re quantities obtained by ab initio calculations at the CCSD(T)/cc-pVQZ level of theory. (c) 2010 Elsevier B. V. All rights reserved.