How to use a variable with SLURM sbatch to set the output/error file name?

We've just switched to using SLURM and I would like to submit a series of jobs using a loop and sbatch. Previously, I could use a variable as part of the output file names. I've been trying to do this in sbatch using --export to pass in the variable but can't get the variable to be interpolated for the std error/output file names. I think it's working for the job name (-J) and --wrap parts though. for i in *fastq.gz; do sbatch \ --export=i=$i --error='$i.eo%j' --output='$i.eo%j' \ -J trim_basename ${i} \ --wrap="fastq_trim_single.sh ${i}" \ ; done Produces output files with $i in the name: $i.eo68065. Is it possible to do what I want to do? Note: ideally, I would like to use basename $i rather than $i for the output file name.