Experimentally exploring the fascinating physics of one- and two-dimensional magnetism continues to rely on the synthesis of novel, model systems with highly anisotropic exchange pathways.In this proposal we are seeking to examine the magnetic properties of a system where we have attempted to chemically and magnetically isolate Ni--F--H--F--Ni chains to form a new 1D magnetic paradigm. We propose to make muSR measurements on the resulting system: [Ni(HF_{2})(3-Xpy){4}]BF{4} (X = Cl, Br). In each of these materials we plan to (i) examine the crossover to 3D long range magnetic order that inevitably takes place at very low temperatures (ii) examine the critical behavior (which is highly dependent on dimensionality) and (iii) probe the magnetic excitation spectrum above any magnetic transition.