I'm not entirely sure about the background of this question, but $\ce{AsF3Cl2}$ before it decomposes above $-75 ^{\circ}$C in liquid phase (1, p. 100) has the following structure:

Crystal structure of solid compound though relates to the mixed halide of $\ce{AsCl4[AsF6]}$ formula (2) with discrete $\ce{AsCl4}$ and $\ce{AsF6}$ units:

(1) Chemistry of arsenic, antimony, and bismuth, 1st ed.; Norman, N. C., Ed.; Blackie Academic & Professional: London ; New York, 1998.
(2) Preiss, H. Z. anorg. allg. Chem. 1971, 380 (1), 45–50. DOI 10.1002/zaac.19713800109

I'm not entirely sure about the background of this question, but $\ce{AsF3Cl2}$ before it decomposes above $-75 ^{\circ}$C in liquid phase (1, p. 100) has the following trigonal bipyramidal structure with two axial F atoms:

Crystal structure of solid compound though relates to the mixed halide of $\ce{AsCl4[AsF6]}$ formula (2) with discrete $\ce{AsCl4}$ and $\ce{AsF6}$ units:

(1) Chemistry of arsenic, antimony, and bismuth, 1st ed.; Norman, N. C., Ed.; Blackie Academic & Professional: London ; New York, 1998.
(2) Preiss, H. Z. anorg. allg. Chem. 1971, 380 (1), 45–50. DOI 10.1002/zaac.19713800109